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RBI Assistant Model Paper 6
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© examsnet.com
Question : 58
Total: 100
The ratio of speed of boat in still water to speed of stream is 11:1. If the boat takes 1 hour more to cover 220 km upstream than to cover same distance in still water. Then find the speed of boat in still water.
22 km / hr
18 km / hr
15 km / hr
20 km / hr
25 km / hr
Validate
Solution:
Let speed of boat in still water =
11
x
Speed of stream =
x
Now ATQ,
220
(
11
x
−
x
)
−
220
11
x
=
1
220
10
x
−
220
11
x
=
1
1
x
(
22
−
20
)
=
1
x
=
2
So speed of boat in still water =
11
×
2
=
22
km
/
hr
© examsnet.com
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