Sun	Mon	Tue	Wed	Thu	Fri	Sat
23	24	25	26	27	28	1
2	3	4	5	6	7	8
9	10	11	12	13	14	15
16	17	18	19	20	21	22
23	24	25	26	27	28	29
30	31	1	2	3	4	5

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Multiple Choice Questions

In a river flowing at 2 km hr a boat travels 32 km upstream and then returns downstream to the start...........

Numerical Ability Boats and Streams

In a river flowing at 2 km/hr, a boat travels 32 km upstream and then returns downstream to the starting plaint. If its speed in still water be 6 km/hr, find the total journey time

16 hours

12 hours

None of these

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Explanation:

speed of the boat = 6 km/hr
Speed downstream = (6+2) = 8 km/hr
Speed upstream = (6-2) = 4 km/hr
Distance travelled downstream = Distance travelled upstream = 32 km
Total time taken = Time taken downstream + Time taken upstream
=32/8 + 32/4 = 32/8 + 64/8 = 96/8 = 12 hr

Hence, option 2 is the correct answer.

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