Question
A motor-cycle covers 110 km with a speed of 45 km/hr.
find the speed of the motor-cycle for the next 110 km journey so that the average speed of the whole journey will be 60 km/hr.Solution
Average speed of whole journey = 60 km/hr Using the formula, average speed = 2xy/(x + y)  x = speed of first 110 km = 45 km/hr 60 = 2 x (45 times x y)/(45 + y) = 90 km/hr
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