Question

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please answer this question

in 2 min

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Answer 1

Answer:

Time taken by the train in first interval

time = d/s = d/60

Now, Time taken by the train in second interval

time = d/s = 2d/80

Now,

average speed = total distance covered/ total time taken

average speed = (d+2d)/(d/60+2d/80)

average speed = 3d/(10d/240)

average speed = 3d×240/10d

average speed = 3d×24/d

average speed = 72 km/h

Explanation:

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Answer 2

Answer:

Time taken by the train in first interval

time = d/s = d/60  

Now, Time taken by the train in second interval  

time = d/s = 2d/80  

Now,  

average speed = total distance covered/ total time taken  

average speed = (d+2d)/(d/60+2d/80)  

average speed = 3d/(10d/240)  

average speed = 3d×240/10d  

average speed = 3d×24/d  

average speed = 72 km/h

Explanation:

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