Bradbury's Eaton's Practical Arithmetic

hours, minutes, and seconds multiplied by 15 will give the difference in longitude in degrees, minutes, and seconds. Hence, 23 m. 54 sec. multiplied by 15 gives the difference in longitude in minutes and seconds, viz. 358′ 39′′ = 5° 58′ 39′′; that is, the difference in longitude between Boston and Washington is 5° 58′ 39′′, Ans. Hence,

Rule.

Multiply the difference in time, expressed in hours, minutes, and seconds, by 15, and the product will represent the difference in longitude in degrees, minutes, and seconds.

148. How many degrees west of Greenwich is New York, the difference in time between Paris and New York being 5 h. 5 m. 21 sec.?

NOTE. The difference in longitude between Paris and New York is found to be 76° 20′ 18′′, and this diminished by 2° 20′ 15′′, the east longitude of Paris, gives 74° 0' 3" for the west longitude of New York. Ans. 74° 0′ 3′′.

149. In going from Boston to Springfield my watch, which is a perfect chronometer, apparently gained 6 m. 61⁄2 sec. What is the longitude of Springfield?

150. When it is 11 o'clock in New York it is 37 m. past 11 in the Bermudas. Find the longitude of the Bermudas.

282. Miscellaneous Oral Exercises.

151. In 33 feet how many yards? How many rods?

152. If I hire a horse and carriage at 163 cents a mile, what must I pay for a ride of 15 miles?

153. A certain rectangular garden is 5 rods long and 3 rods wide; how many square rods does it contain?

154. How many rods round a rectangular garden which is 5 rods long and 3 rods wide?

155. How many square rods in a garden that is 6 rods square? 156. How many rods round a square garden, each side being 6 rods long?

157. How many square rods in a rectangular garden which is

10 rods long and 6 rods wide? How many rods round this garden ? What will it cost to fence it at $1.25 a rod?

158. At $2 a square rod what will half an acre of land cost?

159. How many cubic inches in a rectangular prism or block which is 4 inches long, 3 inches wide, and 2 inches thick? How many square inches in one of its greatest faces? How many in one of its smallest faces? How many in one of the other faces? How many in its six faces ?

160. How many square feet in the surface of a cubical box whose edges are 2 feet in length?

161. How many cubic feet in a cube, each edge of which is 4 feet long?

162. What will 3 cords of wood cost, if 4 cord feet cost $3 ? 163. At 12 cents a pound what will 12 pounds of beef cost? 164. At 33 cents a pound what will 15 pounds of butter cost? 165. How many seconds in 1 m. 30 sec.?

166. How many minutes between half past 9 o'clock and noon? 167. If a man earns $1 a day, how many dollars will he earn in the six working-days of a week?

168. How many days in leap year from the 1st of January to the 10th of March inclusive? How many in a common year? 169. How many days in June, July, and August?

170. At 10 cents a dozen what will 2 gross of buttons cost? 171. At 3 cents apiece what will 2 dozen oranges cost? 172. What will 2 reams of paper cost at 10 cents a quire?

283. Miscellaneous Written Examples.

173. What cost 43 a. 140 sq. rd. of land at $40 an acre?

174. What cost 3 t. 1562 lb. of coal at $6 a ton?

175. What will it cost to build 24 m. 140 rd. of railroad at $ 5775 a mile ?

176. A rectangular field is 40.5 rods long, and 30.5 rods wide; what will it cost to build a wall around it at $1 a rod?

177. How much land in a rectangular field that is 40.5 rods long and 25.75 rods wide?

178. What cost 82.5 lb. of coal at $7 a ton?

179. If 365 days make a year, how many days, hours, etc. are there in 0.785 of a year?

180. What is the cost of 3 pieces of cloth, the first containing 15 yards at $2.25 a yard; the second, 12.5 yards at $3.50 a yard; and the third, 8.8 yards at $3.25 a yard?

181. A three-sided plat of ground is enclosed by a railroad on one side and highways on the other two sides; the side next the railroad is 4.1 rods long, and the other two sides are respectively 4 rods and 0.9 of a rod in length; what is the cost of fencing this plat at $3.75 a rod?

182. How many square feet in a board which is 18.25 feet long and 2.8 feet wide?

183. Bought a load of straw that weighed 1 t. 287 lb. at $8 a ton; what shall I pay for the load?

184. Paid $7.175 for 35 gal. 3 qt. 1 pt. of vinegar; what was the price a gallon ?

185. What is the cost of carpeting a room that is 16.5 feet long and 15 feet wide, the carpet costing $1.25 a square yard?

186. If a family use 29 gal. 3 qt. 2 gi. of molasses in 6 months, what is the average a month?

187. If 10 t. 1825 lb. of hay is harvested from 5 acres, what is the crop on one acre?

188. If 8 boxes of sugar weigh 2 t. 760 lb., what is the weight of a box?

189. If 9 grain-bins contain 143 bush. 2 pk. 2 qt. 1 pt. of grain, what does 1 bin contain ?

190. If a man travel 212 m. 66 rd. in 7 days, what distance does he travel a day?

191. How many years, months, and days from Apr. 19, 1874, to Feb. 7, 1879 ?

192. Find the exact number of days, hours, and minutes from Dec. 7, 1875, 4 o'clock P. M., to June 21, 1876, 9 h. 30 m. a. M.

193. When it is 1 h. 30 m. A. M. in San Francisco, what time is it in Oahu?

194. When it is noon in Boston, what time is it in Rome? In San Francisco? In Oahu? In Calcutta?

195. Two travellers, A and B, one from Maine, the other from the West, meeting in Boston, and comparing their watches with Boston time, A finds his 10 minutes too slow and B finds his 3 minutes too fast. Which one came from Maine, and how many degrees apart were the places in which their watches showed the correct time?

196. A steamer sailed from London July 14, 1877, at exactly 2 P. M., and cast anchor off the dock in New York while the clocks were striking 9 P. M., July 28, 1877. How long was the voyage?

284. METRIC EQUIVALENTS.

The following equivalents of the metric measures and weights have been established by Congress for use in all legal proceedings.