A train moves at a constant speed of 120 km/ h for one kilometre and at 40 kmph for the next one kilometre. What is the average speed of the train?
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Answer:
60 km/hr
Explanation:
total distance = 2 km
Time = distance /speed
T1 = 1 /120 hr
T2 = 1/40 hr
total time = 1/30 hr
average speed= total distance /total time
= 2×30
= 60 km /hr
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