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Let the sum = Rs. x According to the question, x(1 + 12/100)2 – x – x × 12% × 2 = 180 784x/625 – x – 6x/25 = 180 159x/625 – 6x/25 = 180 9x/625 = 180 x = Rs. 12500
A train 400 metre long takes 40 sec to cross a man running at a speed of 4 km/hr in the direction same to that of train. What is the speed of the train?
A train running at 90 km/h crosses an electric pole in 18 seconds and a platform in 55 seconds. What is the length of the platform?