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- A boat goes 24 km upstream and 28 km downstream in 6 hrs.
Question 1:
A boat goes 24 km upstream and 28 km downstream in 6 hrs. If it goes 30 km upstream and 21 km downstream in 6 hrs and 30 mins,find the speed of the stream.
A. 5 km/hr
B. 4 km/hr
Feedback Let the speed of the boat be x kmph and stream be y kmph
Downstream = x + y kmph and Upstream = x - y kmph
= 24 / (x-y) + 28 / (x+y) = 6 and
= 30 / (x-y) + 21 / (x+y) = 13 / 2 ,
Upon solving we get x= 10 and y = 4.
Speed of the stream = 4km / h.
Downstream = x + y kmph and Upstream = x - y kmph
= 24 / (x-y) + 28 / (x+y) = 6 and
= 30 / (x-y) + 21 / (x+y) = 13 / 2 ,
Upon solving we get x= 10 and y = 4.
Speed of the stream = 4km / h.
C. 6 km/hr
D. 10 km/hr
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