The speed of a boat in still water is 8 kmph. If it can travel 1 km upstream in 1 hr, what time it would take to travel the same distance downstream? 1 minute 2 minutes 3 minutes 4 minutes
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The boat travel upstream => v( boat/bank) = v(boat/water) - v(water/bank)
= 8 - x
It takes 1hr to travel 1km => v(boat/bank) = s/t =1/1 <=> 8-x=1 =>x=7kmph
The boat travel downstream => v(boat/bank) = v(boat/water) + v(water/ bank)
= 8+7=15kmph
Time to travel 1km downstream: t' = s/v = 1/15 (hr) = 60* (1/15) =4 minutes
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