Question

The distance between A and B is 3400 m. Amy walks from A to B in 40 minutes and takes 5 minutes more to return to A. What is Amy's average speed in m/min for the whole journey from A to B and back to A again?

The distance between A and B is 3400 m. Amy walks from A to B in 40 minutes and takes 5 minutes more to return to A. What is Amy's average speed in m/min for the whole journey from A to B and back to A again?

Answer 1

`80`m/min

Explanation:

Distance between A to B = `3400m`
Distance between B to A = `3400m`

Therefore, total distance from A to B and back to A = `3400+3400` = `6800m`

Time taken by Amy to cover the distance from A to B = `40 min`
and, time taken by Amy to return back from B to A = `45 min` (because she takes `5` more minutes in the return journey from B to A)

So, total time taken by Amy for the entire journey from A to B to A = `40+45 = 85min`

Average speed = total distance/total time = `(6800m)/(85min)` = `80` m/min