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CMAT 2016 Solved Question Paper
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© examsnet.com
Question : 10
Total: 100
If a boat travels upstream from A to B and then downstream from B to A covering 100 km in 9 h. If the speed of the boat in still water is 10 km/h more than the speed of the stream, then what would have been the speed of the stream?
1.50 km/h
1.25 km/h
2.50 km/h
3.75 km/h
Validate
Solution:
(b) Let the speed of stream be x
Speed of boat = 10 + x
Speed downstream = 10 + x + x = 2x + 10
Speed upstream = 10 + x - x = 10
According to the question,
50
2
x
+
10
+
50
10
= 9
⇒
500
+
100
x
+
500
(
2
x
+
10
)
10
= 9
⇒ 1000 + 100x = 180x + 900
⇒ 80x = 100
⇒ x =
10
8
⇒ x = 1.25 km/h
© examsnet.com
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