A bike covers 60 km with a speed of 20 km/hr. Find the speed of the bike for the next 50 km journey so that the average speed of the whole journey will be 30 km/hr.
Let the speed for the next 50 km be x kmph. Average Speed = Total Distance/Total Time Total Distance = 60 + 50 = 110 km Total Time = 60/20 + 50/x = (3 + 50/x) hours => 30 = 110/(3 + 50/x) => 90 + 1500/x = 110 => 110x – 90x = 1500 => 20x = 1500 => x = 75 kmph
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‘A’ and ‘B’ started moving towards each other at same time with a speed of 27 km/hr and 15 km/hr, respectively. If the distance covered by ‘Aâ...
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A truck covers 376 km at a certain speed in 8 hours. How much time would a car take at an average speed of 13 km/h more than that of the speed of the tr...
A train moving at 3/5th of its normal speed reaches its destination 10 hours late. Find the normal time taken by it.
