Question:

A train starting from rest first accelerates
uniformly up to a speed of 80 km/h for time t, then
it moves with a constant speed for time 3t. The
average speed of the train for this duration of
journey will be (in km/h) :   

(1) 80

(2) 70 

(3) 30

(4) 40

                                                                           JEE-2024

Solution:                
A train starting from rest first accelerates uniformly up to a speed of 80 km/h for time t, then it moves with a constant speed for time 3t. The average speed of the train for this duration of journey will be (in km/h) : (1) 80 (2) 70 (3) 30 (4) 40 JEE-2024

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