A boat moves with a speed of $5 \,km/h $ relative to water in a river flowing with a speed of $3 \,km/h$ and having a width of $1 \,km$. The minimum time taken around a round trip is.........$min$
$5$
$60 $
$20$
$30 $
A boat moves with a speed of $5 \,km/h $ relative to water in a river flowing with a speed of $3 \,km/h$ and having a width of $1 \,km$. The minimum time taken around a round trip is.........$min$
For the round trip he should cross perpendicular to the river
$\therefore $Time for trip to that side $ = \frac{{1km}}{{4km/hr}} = 0.25\,hr$
To come back, again he take $0.25$ hr to cross the river.
Total time is $30\, min$, he goes to the other bank and come back at the same point.
$\therefore $Time for trip to that side $ = \frac{{1km}}{{4km/hr}} = 0.25\,hr$
To come back, again he take $0.25$ hr to cross the river.
Total time is $30\, min$, he goes to the other bank and come back at the same point.
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