Posted by PLEASEEEEE on Sunday, October 9, 2011 at 7:22pm.
Use this proportion. Cross multiply and solve for x -- the time it takes the front of the train to go through the tunnel.
15/60 = 1/x
15x = 60
x = 60/15 = 4 minutes for the front of the train to go through the tunnel.
It takes the rear of the train the same time.
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