Prem and Shyam decide to go on a trip to point Y on a particular day from point X Prem leaves for po...........

Quantitative Aptitude ( CCS) Time & distance

Prem and Shyam decide to go on a trip to point Y on a particular day from point X. Prem leaves for point Y at 11 : 00 am, at speed of 72 km/hour. Shyam leaves for point Y at 11: 30 same day as Prem left. At what speed should Shyam travel to catch up with Prem in 4 hours ? (in km/hour)

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Explanation:

Distance covered by Prem in half an hour
= 72 × 1/2 = 36 km
Shyam has to cover an additional distance of 36 km in 4 hours.
Relative speed of Shyam =(x - 72)kmph
∴ 36/(x- 72) = 4
= x - 72 = 9
= x = 81 kmph