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The diameter of the tyres of a car is 63 centimetres. If the car is dr
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09 Aug 2017, 09:54
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
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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Re: The diameter of the tyres of a car is 63 centimetres. If the car is dr
[#permalink]
10 Aug 2017, 23:24
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
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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Re: The diameter of the tyres of a car is 63 centimetres. If the car is dr
[#permalink]
10 Aug 2017, 23:48
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.
In one hour the car will cover 9.45pi kms= 30 kms/hr approx speed.
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Data Sufficiency (DS) Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
gmatclubot
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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