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Downstream speed = 48/3 = 16 km/hr Upstream speed = 48/12 = 4 km/hr So speed of boat in still water = (16 + 4)/2 = 10 km/hr
A train 450 metres long is running at a speed of 54 km/hr. If it crosses a tunnel in 1 minute, then the length of the tunnel (in meters) is:
Without stopping the speed of the train is 135 kmph, with stopping the speed of the train is 90 kmph.Find the stop time of the train?
Two trains running in a opposite directions crosses pole in 84s and 57s respectively and they cross each other in 72s. Find the ratio of their speeds?