a train moves with a speed of 30 km per hour in first 15 minute with another speed of 40 km per hour the next in 15 minutes and then with a speed of 60 km per hour in the last 30 minutes calculate average speed of train of the journey
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average speed =s1+s2+s3÷t1+t2+t3=30+40+60÷15+15+30=2.167 km/h
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