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SSC CGL Tier 2 Exam 25 Oct 2015 Paper 1
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© examsnet.com
Question : 39
Total: 100
The diameter of each wheel of a car is 70 cm. If each wheel rotates 400 times per minute, then the speed of the car (in km/hr) is
(
T
a
k
e
π
=
22
7
)
0.528
528
52.8
5.28
Validate
Solution:
(3) Circumference of the wheel of car
=
π
×
d
=
22
7
×
70
=
220
cm
= Distance covered in one rotation
∴Distance covered by car in 1 minute = (400 × 220) cm.
∴ Distance covered by car in 1 hour = (400 × 220 × 60) cm.
=
(
400
×
220
×
60
1000
×
100
)
k
m
=
52.8
k
m
.
∴ Speed of car = 52.8 kmph
© examsnet.com
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