A train travelled at a speed of 35 km/hr for the first 10 minutes and at a speed of 20 km/hr for the next 5 minutes. The average speed of the train for the total 15 minutes is

A train travelled at a speed of 35 km/hr for the first 10 minutes and

1.	A train travelled at a speed of 35 km/hr for the first 10 minutes and at a speed of 20 km/hr for the next 5 minutes. The average speed of the train for the total 15 minutes is
A.	30 km/hr
B.	23 km/hr
C.	31 km/hr
D.	29 km/hr
Answer» B. 23 km/hr

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A train travelled at a speed of 35 km/hr for the first 10 minutes and at a speed of 20 km/hr for the next 5 minutes. The average speed of the train for the total 15 minutes is

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