Q.
A swimmer wishes to cross a 500-m river flowing at 5 kmh-1. His speed with respect to water is 3 kmh-1. The shortest possible time to cross the river is
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a
10 min
b
20 min
c
6 min
d
7.5 min
answer is A.
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Detailed Solution
Shortest time =dv=1/23=16 h=10 min
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