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The diameter of the tyres of a car is 63 centimetres. If the car is dr

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Joined: 27 Jan 2016
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The diameter of the tyres of a car is 63 centimetres. If the car is dr [#permalink]

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New post 09 Aug 2017, 09:54
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The diameter of the tyres of a car is 63 centimetres. If the car is driven at a constant speed such that the tyre makes one 360-degree rotation in 0.24 seconds, what is the approximate speed of the car in kilometres per hour?


A)25 kilometre per hour
B)30 kilometre per hour
C)60 kilometre per hour
D)171 kilometre per hour
E)180 kilometre per hour
[Reveal] Spoiler: OA

Kudos [?]: 61 [0], given: 93

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Joined: 18 Aug 2016
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Kudos [?]: 139 [0], given: 123

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Re: The diameter of the tyres of a car is 63 centimetres. If the car is dr [#permalink]

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New post 10 Aug 2017, 23:24
srikanth9502 wrote:
The diameter of the tyres of a car is 63 centimetres. If the car is driven at a constant speed such that the tyre makes one 360-degree rotation in 0.24 seconds, what is the approximate speed of the car in kilometres per hour?


A)25 kilometre per hour
B)30 kilometre per hour
C)60 kilometre per hour
D)171 kilometre per hour
E)180 kilometre per hour


circumference = 22/7 * 63 = 198 cm
198 cm in 0.24 s
1.98 m in 0.24 s
8.25 m/s to km/hr (multiply by 18 and divide by 5)
29.7 km/hr
~B
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Location: India
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Re: The diameter of the tyres of a car is 63 centimetres. If the car is dr [#permalink]

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New post 10 Aug 2017, 23:48
the car covers 63pi in 0.24 seconds.
In one hour the car will cover 9.45pi kms= 30 kms/hr approx speed.

Kudos [?]: 39 [0], given: 179

Re: The diameter of the tyres of a car is 63 centimetres. If the car is dr   [#permalink] 10 Aug 2017, 23:48
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