SOLUTION: A train 100 meter long takes 3 second to cross a man walking at the rate of 6km/hr in a direction opposite to that of the train. Find the speed of the train.

Question 1036256: A train 100 meter long takes 3 second to cross a man walking at the rate of 6km/hr in a direction opposite to that of the train. Find the speed of the train.

Answer by ikleyn(52777) (Show Source): You can put this solution on YOUR website!
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A train 100 meter long takes 3 second to cross a man walking at the rate of 6km/hr in a direction opposite to that of the train.
Find the speed of the train.
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Let "u" be the speed of the train (in meters/minute !), now unknown.

Then the equation is

0.05*u + 100*0.05 = 100     (1)

(0.05 is the 0.05 minute =  minute = 3 sec;
100  = 6  =  = 100  ).

Simplify and solve (1):

0.05u + 5 = 100,

0.05u = 100 - 5 = 95,

u =  = 1900  = 114 .

Answer.  The speed of the train is 114 .

Solved.

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