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?

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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?

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Answer 1 · 2017-12-29T04:35:26

$80$ $80$ m/min

Explanation:

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

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

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

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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?