A swimmer wishes to cross a 500-m river flowing at 5 km h -1. His speed with respect to water is 3 km h -1. The shortest possible time to cross the river is

Question

A swimmer wishes to cross a 500-m river flowing at 5 km h -1. His speed with respect to water is 3 km h -1. The shortest possible time to cross the river is (A) 10 min (B) 20 min (C) 6 min (D) 7.5 min

Tardigrade Admin · Accepted Answer

Shortest time =(d/v)=(1 / 2/3)=(1/6) h =10 min

Q. A swimmer wishes to cross a $500 - m$ river flowing at $5 km h^{- 1}$ . His speed with respect to water is $3 km h^{- 1}$ . The shortest possible time to cross the river is

$10 min$

$20 min$

$6 min$

$7.5 min$

Shortest time $= \frac{d}{v} = \frac{1/2}{3} = \frac{1}{6} h = 10 min$

Q. A swimmer wishes to cross a 500−m river flowing at 5kmh−1. His speed with respect to water is 3kmh−1. The shortest possible time to cross the river is

10min

20min

6min

7.5min