A boat travels upstream from b to a and downstream from a to b in 3 hours. if the speed of boat in still water is 9 km/hr and the speed of the current is 3 km/hr. then find the distance between a and
b..
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total time =3hr
speed in downstream=9+3 =12kmph
speed in upstream=9-3=6kmph
let the distance b/w a to be x
so, time in going b to a (upstream)=x/6 hr
time in going a to b (downstream)=x/12 hr
as , x/6 + x/12=3
so, 2x+x/12=3
so, 3x=12×3=36
so, x=36/3=12 km.
Thanks.
speed in downstream=9+3 =12kmph
speed in upstream=9-3=6kmph
let the distance b/w a to be x
so, time in going b to a (upstream)=x/6 hr
time in going a to b (downstream)=x/12 hr
as , x/6 + x/12=3
so, 2x+x/12=3
so, 3x=12×3=36
so, x=36/3=12 km.
Thanks.
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