Question

By walking at three fourth of his usual speed a man reaches his office 20 minutes later than his usual time the usual time taken by him to reach his office is

Answer 1

Answer:

Step-by-step explanation:

Let L be the distance, V be his usual speed.

We have L/(3/4 V) = L/V + 20.

So, 4/3 * L/V = L/V + 20,

Or 1/3 * L/V = 20,

we get L/V = 60 (min)

Since V is his usual speed, so T = L/V his usual time for

him walking from to the office.

Another way , let T (min) be the usual time, then he spent 4 T/3

when walking in 3/4 of usual speed.

Since 4T/3 = T +20, we obtain T = 60 min.