Two men A and B walk from P to Q a distance of 28 km at 3 and 4 km an hour respectively B reaches Q ...........

Quantitative Aptitude ( CCS) Time & distance

Two men A and B walk from P to Q, a distance of 28 km, at 3 and 4 km an hour respectively. B reaches Q, returns immediately and meets A at R. Find the distance from P to R.

16km

20km

18km

24km

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Explanation:

Solution:
When B meets A at R, B has walked the distance PQ + QR and A the distance PR.
That is , both of them have together walked twice the distance from P to Q, i.e 56 km.
Hence the distance PR travelled by A = 3/7 of 56 km = 24 km