A and B are two cities. A man travels from A to B at 35 km/ hr and returns at the rate of 15 km/hr. Find his average speed for the whole journey?
A24 km/hr
B15 km/hr
C20 km/hr
D21 km/hr
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അമൽ ഒരു യാത്രയുടെ ആദ്യത്തെ 2 മണിക്കൂർ സമയം 30 കി. മീ. മണിക്കൂർ
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At an average of 80 km/hr Shatabdi Express reaches Ranchi from Kolkata in 7 hrs. The distance between Kolkata and Ranchi is