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

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Manager
Joined: 27 Jan 2016
Posts: 130
Schools: ISB '18
GMAT 1: 700 Q50 V34
The diameter of the tyres of a car is 63 centimetres. If the car is dr  [#permalink]

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09 Aug 2017, 09:54
1
00:00

Difficulty:

55% (hard)

Question Stats:

59% (03:16) correct 41% (01:22) wrong based on 17 sessions

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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

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Current Student
Joined: 18 Aug 2016
Posts: 618
Concentration: Strategy, Technology
GMAT 1: 630 Q47 V29
GMAT 2: 740 Q51 V38
Re: The diameter of the tyres of a car is 63 centimetres. If the car is dr  [#permalink]

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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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Luckisnoexcuse
Manager
Joined: 06 Jul 2014
Posts: 93
Location: India
Concentration: Finance, Entrepreneurship
GMAT 1: 660 Q48 V32
Re: The diameter of the tyres of a car is 63 centimetres. If the car is dr  [#permalink]

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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.

--== Message from the GMAT Club Team ==--

THERE IS LIKELY A BETTER DISCUSSION OF THIS EXACT QUESTION.
This discussion does not meet community quality standards. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

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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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