Question

Please help :) A motor runs at 65 meters per second, and its speed is decreased by 10 meters per second every second. How many seconds will it take to drop below 8 meters per second?

Answer 1

Total drop in motor speed is 65 - 8 = 57 meter/sec. If in one second, motor speed drops by 10, then how many seconds does it take to drop by 57? Solve by direct proportion:

Answer 2

Is it 570 sec?

Answer 3

By cross multiplying you get 57 times 1 over 10.

So it is 5.7 seconds.

Answer 4

Ahhh.So this is the answer?

Answer 5

@hartnn ? :)

Answer 6

Yes 5.7 seconds is the answer