SSC CHSL 2021 · PYQ · Speed, Distance and Time · medium
A car takes 50 minutes to cover a certain distance at a speed of 54 km/h. If the speed is increased by 25%, then how long will it take to cover three-fourth of the same distance?
A.35 minutes
B.40 minutes
C.30 minutes✓ Correct
D.25 minutes
Explanation
Distance = 54 × 50/60 = 45 km. New speed = 54 × 1.25 = 67.5 km/h. New distance = 3/4 × 45 = 33.75 km. Time = 33.75/67.5 × 60 = 30 minutes.
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