A woman travelled from the home to bank at the rate of 20kmph and walked back at the rate of 5 kmph ...........

Quantitative Aptitude (CDS) Time & distance

A woman travelled from the home to bank at the rate of 20kmph and walked back at the rate of 5 kmph. If the whole journey took 4 hours 30 minutes, find the distance of the bank from her home?

16km

17km

18km

19km

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Explanation:

Average speed = (2xy)/(x+y)kmph
=(2×20×5)/(20+5)kmph
= 8kmph
Distance travelled in 4hour 30 minutes i.e, 9/2 hours= (9/2×8)km = 36km
Distance of the bank from the home = (36/2)km = 18km