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Why would anyone use a measuring instrument that is not very accurate?
When they need an approximate measurement. The scales used to weigh a truckload of gravel are not as accurate as laboratory scales that can measure the weight of a pencil mark on a bit of paper- but extreme accuracy is not needed for the gravel truck.
How much does gravel weigh?
The more gravel you have, the more it weighs.
How much does 1 square meter of gravel weigh?
depend on the stone used for the gravel.
How much does 1 cubic yard of gravel weigh?
This depends on the size of gravel, the water content of the gravel, and the material composition of the rock used to make the gravel. Typically 1 cu.yd. of gravel wieghs 3000 lb.
If one machine can complete a truckload in 2 hours and the second machine can complete a truckload in 4 hours how long would it take to complete a truckload if both machines worked on it together?
Machine # 1 works at a rate of 1/2 truckload per hour, while machine 2 works at a rate of 1/4 truckload per hour. The two machines together work at a rate of 3/4 truckload per hour complete the job 1/(3/4) = 1-1/3 hours.
