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A train 200 m long
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09 Apr 2021, 05:11
09 Apr 2021, 05:11
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A train 200 m long is traveling at a speed of 60km/h. How long will the train take to pass a person walking 3 km/h in the opposite direction?
Give the answer as a fraction in seconds
Kudos for the right answer and explanation
Question part of the project GRE Quantitative Reasoning Daily Challenge - (2021) EDITION
GRE - Math Book
Give the answer as a fraction in seconds
Show: :: OA
\(\frac{80}{7}\) seconds
Kudos for the right answer and explanation
Question part of the project GRE Quantitative Reasoning Daily Challenge - (2021) EDITION
GRE - Math Book
Re: A train 200 m long
[#permalink]
09 Apr 2021, 06:17
09 Apr 2021, 06:17
1
Length of the train = 200 m = 0.2 km
So, 0.2 km = (60 km/h + 3 km/h) * t [As both are approaching from opposite side the relative speed will the sum of both speed]
0.2 km = 63 km/h * t
t = 0.2 km / 63 km/h
t = 0.2 / 63 h
t = (2 * 3600) / (10 * 63) s
t = 80 / 7 s
So, 0.2 km = (60 km/h + 3 km/h) * t [As both are approaching from opposite side the relative speed will the sum of both speed]
0.2 km = 63 km/h * t
t = 0.2 km / 63 km/h
t = 0.2 / 63 h
t = (2 * 3600) / (10 * 63) s
t = 80 / 7 s
gmatclubot
Re: A train 200 m long [#permalink]
09 Apr 2021, 06:17
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