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RRB Paramedical Staff Nurse Model Paper 9
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© examsnet.com
Question : 51
Total: 100
The total distance between two destinations is ‘x’ km. If the distance travelled along the stream is thrice of the total distance and the distance travelled against the stream is double of the total distance. If the time taken to cover the distance along the stream is 40% less than the time taken to cover the distance against the stream. If Sundar covers a distance of 21 km in 1 hour 24 minutes along the stream, then find the stream speed?
2.5 kmph
3.5 kmph
1.5 kmph
4.5 kmph
Validate
Solution:
T(down)/T(up)
=
60
100
T(down)
=
3
x
Downstream Speed
T(up)
=
2
x
Upstream Speed
Downstream Speed
=
21
(
84
/
60
)
=
15
kmph
60
100
=
[
3
x
/
15
]
[
2
x
/
Upstream Speed
]
Upstream Speed
=
6
kmph
Stream Speed
=
15
−
6
/
2
=
4.5
kmph
© examsnet.com
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