The length of a train and that of a platform are equal. If with a speed of 90 k/hr, the train crosses the platform in one minute, then the length of the train (in metres) is: Choose the correct choice from the following:
A) 400
B) 525
C) 750
D) 850
E) None
Sol.   Speed = [90 * 5/18] m/sec = 25 m/sec; Time = 1 min. = 60 sec.   Let the length of the train and that of the platform be x metres.   Then, 2x/60 = 25 ⇔ x = 25 * 60 / 2= 
<gadget id="calculator">25 * 60 / 2</gadget>
<output>750</output>
750   Answer 750
<result>C</result>
The length of a train and that of a platform are equal. If with a speed of 90 k/hr, the train crosses the platform in one minute, then the length of the train (in metres) is: