Question

A train travels in a straight line at a constant speed of 60 km/h for a particular distance d and then travels another distance equal to 2d in the same direction at a constant speed of 80 km/hr in the same direction as it was in the it was previously going a) What is the average speed of the train during the whole journey​

Answer 1

Answer:

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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

Step-by-step explanation:

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