Question

A train covers 70km in first one hour, next 40 km in next 0.5 hour and next 50km in another 0.7 hour. What is the avetage speed of the train

Answer 1

Hello dear 
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Case I 
s = 70 km 
t  = 1 h 
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Case II 
s =  40 km 
t - 0.5 h 
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Case III 
s = 50 km 
t = 0.7 h 
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Average speed = Total distance / Total Time 
                         =  70 + 40 + 50  /  1 + 0.5 + 0.7 
                         = 160 / 2.2 
                         = 72.72 km/hr 
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Answer 2

Answer:

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Total distance = 70+40+50=160

Total time. =1+0.5+0.7=2.2

Average speed =total distance /total time taken

=160/2.2

=1600/22= 72.72

Average speed =72.72 km/h.