To lift a heavy crate, a man uses a block and tackle attached to the bottom of an i-beam at hook b. knowing that the moments about the y and the z axes of the force exerted at b by portion ab of the rope are, respectively, 120 n·m and –460 n·m, determine the distance a, which is the distance from the y axis to the hook b.

total distance travelled = 60 miles

total time taken =1.5 hours

average speed = total distance / total time

60 / 1.5

= 40

therefore, average speed = 40 m/h

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answer; equivalent to a one(1) horsepower motor;

i don't understand. explain it clearly

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