A) 50
B) 53.33
C) 48
D) 70
Correct Answer: B
Solution :
Distance travelled by train in first 1 hour is 60 km and distance in next 1/2 hour is 20 km. So Average speed\[=\frac{\text{Total distance }}{\text{Total time }}=\frac{60+20}{3/2}\] \[=53.33\ km/hour\]
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