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Travelling at 54 km/h, Chaman reaches a place 3 minutes early. If he had travelled at 48 km/h, he would have been 1 minute late. What distance did Chaman have to travel?
A25.8 km
B31.5 km
C28.0 km
D28.8 km
Answer & Solution
Correct answer: D. 28.8 km
1. The time difference between the two speeds is 3 + 1 = 4 minutes = 4/60 hour.
2. d/48 - d/54 = 4/60. Now 1/48 - 1/54 = (54 - 48)/2592 = 6/2592 = 1/432.
3. So d/432 = 1/15, giving d = 432/15.
4. d = 28.8 km.
_Source: RRB Group D CEN-02/2018 PYQ, Q.17._
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