A boat travels at a speed of 15 kmph. It travels between points A and B, which are 200 km apart. If the boat goes downstream from A to B in 10 hours, how long will it take to return upstream from B to A (in hours)?
Explanation:
Sdown = 15 + Ss
T = DSdown=20015+Ss
10 = 20015+Ss
15 + Ss = 200/10 = 20
Ss = 5 kmph
T = DSup=20015-5
Hence, option (a).
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