the boat speed in still water is 30 km per hour a boat travels for 3 hours downstream and then returns the same distance upstream in 5 hours. find the speed in upstrem.
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Given
Boat speed in still water =30km/hr
time of downstream =3hr
time of upstream=5hr
let distance be X
Speed of up stream = X/5
Speed of down stream = X/3
so according to question
( X/5 +30)= (X/3 - 30)
X/3 - x/5 =60
2x/15=60
x = 450
now speed of upstream = 450/5=90km/hr
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