3. Ravi-travelled 40 km upstream. If his speed in still
water was 3 km/hr less and the speed of the stream
was 3 km/hr more, he would have taken 6 hrs more
for the trip. Find the time taken for the upstream trip.
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Answer:
Speed of the stream =3km/hr
Upstream time = 6hrs
Downstream time = 4hrs
Let the distance between the two parts be x km
Down speed stream=x/4 km/hr
Upstream speed= x/6km/hr
Speed of stream=1/2(x/4-x/6)
=1/2(3x-2x)/12
=x/24
Speed of stream =x/24 =3x =72km
∴ Distance is 72km
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