1.

A train 280m long is running at a speed of 42km/hr. How much time will it take to pass a man standing on a platform

Answer»
time =  \frac{distance}{speed}  \\  \\  \frac{280}{42 \times  \frac{5}{18} }  = time \\  \frac{280 \times 3}{35}  = time \\  \\ time = 24sec
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