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Re: If two trains ,travelling at a speed of 72mph and 48 mph respectively, [#permalink]
adewale223 wrote:
Let distance between them 1 minute before collision be x

Sum of their speeds = 72 + 48 = 120

Therefore 1/60 = x/120

x = 2 miles
Answer A.

Adewale Fasipe, quant instructor from Lagos Nigeria.


From where did you get 1/60? Could you pls explain the logic? adewale223
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Re: If two trains ,travelling at a speed of 72mph and 48 mph respectively, [#permalink]
1
Jeeth15 wrote:
adewale223 wrote:
Let distance between them 1 minute before collision be x

Sum of their speeds = 72 + 48 = 120

Therefore 1/60 = x/120

x = 2 miles
Answer A.

Adewale Fasipe, quant instructor from Lagos Nigeria.


From where did you get 1/60? Could you pls explain the logic? adewale223




Since the speeds are in miles per hour, you convert their time apart to hour. To convert minute to hour you divide by 60.
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