A car travels 300 km at 60 km/h and returns at 40 km/h. The average speed for the whole journey is: (CDS PYQ)
A48 km/h
B50 km/h
C52 km/h
D54 km/h
Question 3
A 200m long train crosses a 300m platform in 25 seconds. The speed of the train is: (CDS PYQ)
A18 km/h
B20 km/h
C36 km/h
D72 km/h
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