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Trains Boats and Streams Practice Test 1 with solutions
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© examsnet.com
Question : 8
Total: 40
A sailor goes 12 km downstream in 48 minutes and returns in 1 hour 20 minutes. The speed of the sailor in the still water is:
12 km/hr
12.5 km/hr
13 km/hr
15 km/hr
Validate
Solution:
👈: Video Solution
Speed downstream a =
D
T
a =
12
48
60
=
12
×
60
48
= 15 km
Speed upstream b =
12
1
+
1
3
=
12
4
3
=
12
×
3
4
= 9 km
Speed of the sailor in the still water =
1
2
(
a
+
b
)
=
1
2
(
15
+
9
)
=
1
2
×
24
= 12 kmph
© examsnet.com
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