Question

A train travels at a speed of 60km/h for 0.52h ,at 30km/h for the next 0.24h and then at 70 km/h. What is the average speed of the train?

Answer 1

Hello dear 
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1st case :
speed of train = 60 km /hr 
time taken      = 0.52 hr 
distance         = 60 X 0.52 = 31.2 km 
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2nd case : 
Speed of train = 70km/hr
time taken       = 0.24 hr 
distance          = 70 X 0.24 = 16.8 km 
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Average speed = total distance / total time 
                         = 31.2 + 16.8   / 0.52+0.24 
                         = 48/0.76 
                         = 63.16 km/hr 
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