Question
A person sees a train passing over 5 km long bridge. The
length of the train is half that of bridge if the train clears the bridge in 6 mins. What is the speed of the train?Solution
Distance covered in 6/60 hours = (5 + 5/2) = 7.5 km Distance covered in 1 hour = 7.5 x (60/6) = 75 km So, speed of the train = 75 km/hr
If cos4 B - sin4 B =
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