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IBPS RRB Office Assistant 13 Nov 2016 Paper
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© examsnet.com
Question : 65
Total: 80
A person covers a certain distance by travelling at a uniform speed of 120 km per hour for 90 minutes. At what speed will he have to travel in order to cover the same distance in 1 hour 20 minutes? (in km per hour)
135
125
140
130
145
Validate
Solution:
(1) Distance covered in 90 minutes i.e.,
3
2
hours
= Speed × Time
= 120 ×
3
2
= 180 km.
Again, time = 1 hour 20 minutes
=
1
1
3
hours
=
4
3
hours
∴
Required speed
=
D
i
s
t
a
n
c
e
T
i
m
e
=
(
180
4
3
)
k
m
p
h
=
(
180
×
3
4
)
k
m
p
h
=
135
k
m
p
h
© examsnet.com
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