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IBPS RRB Office Assistant 23 Sep 2017 Paper
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© examsnet.com
Question : 76
Total: 80
The time taken by a boat to travel 198 km downstream is 2 hours less than that taken to travel the same distance upstream. If the speed of the boat downstream is 22 km/h, what is its speed in still water ? (in kmph)
20
18
16
14
15
Validate
Solution:
(1) Rate downstream of boat= 22 kmph
∴ Time taken in covering 190km. =
198
22
= 9 hours
∴Time taken by boat in covering 190km upstream
= (9 + 2) hours = 11 hours
∴ Rate upstream of boat
=
198
11
= 18 kmph.
∴ Speed of boat in still water
=
1
2
(22 + 18) kmph.
= 20 kmph.
© examsnet.com
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