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AFCAT II 2015 Solved Paper
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© examsnet.com
Question : 65
Total: 100
A steamer moves with a speed of 4.5 km/h in still water to a certain upstream point and comes back to the starting point in a river which flows at 1.5 km/h. The average speed of steamer for the total journey is
12 km/h
9 km/h
6 km/h
4 km/h
Validate
Solution:
Speed of steamer in down stream = 4.5 + 1.5 = 6km
speed of steamer in up stream = 4.5 – 1.5 =3km
let the distance be x.
time taken in down stream =
x
6
time taken in up stream =
x
3
Avg. speed =
total distance
total time
x
+
x
x
6
+
x
3
⇒
2
x
(
3
x
6
)
= 4 km/h
© examsnet.com
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