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A boy rides his motorcycle 45 km at an average rate of 25 km/hr and 30 km atan average speed of 20 km/hr. What is the average speed during the entire trip of 75 km

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A train travelling at y km/hr arrives at its destination 1 hour late after describinga distance of120 km. What should have been its speed in order that it arrives ontime A motorist travels from P to Q in the rate of 30 km/hr and returns from Q to P atthe rate of 45 km/hr. If the distance PQ = 120 km. Find the average speed for theentire trip