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A swimmer can swim downstream at 13 km/h and upstream at 7 km/h. Find the speed of swimmer in still water.

A6 km/h

B20 km/h

C10 km/h

D8 km/h

Answer:

C. 10 km/h

Read Explanation:

Let speed of swimmer in still water is S and speed of current is C S + C = 13 S - C = 7 S=[13+7]/2 =10


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നിശ്ചല ജലത്തിൽ ഒരു ബോട്ടിന്റെ വേഗത മണിക്കൂറിൽ 12 കി.മീ. ആണ്. 'A', 'B' എന്നീ രണ്ട് പോയിന്റുകൾക്കിടയിൽ, ബോട്ടിന് മുകളിലേക്ക് പോകാൻ 6 മണിക്കൂറും, താഴേക്ക് 4 മണിക്കൂർ സമയവും എടുക്കും. നദിയിലെ ഒഴുക്കിന്റെ വേഗത എത്രയാണ് ?