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Without any halts, Sunil covers a distance at an average speed of 80 km/hr. With halts, he covers it at an average speed of 60 km/hr. How many minutes per hour does he stop?
A20 minutes
B25 minutes
C15 minutes
D10 minutes
Answer & Solution
Correct answer: C. 15 minutes
1. Stoppage time per hour = (difference in speed / actual speed) × 60.
2. = (80 − 60)/80 × 60 = (20/80) × 60.
3. = 15 minutes per hour.
_Source: RRB Group D CEN-02/2018 PYQ, Q.34._
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