Question

A car travels 30 km at a uniform speed of 40 km/h and
the next 30 km at a uniform speed of 20 km/h. Find its
average speed
(a) 26.7 km/h
(b) 25.7 km/h
(c) 24.7 km/h
(d) 2.67 km/h​

Answer 1

Answer:

25.7km/hr

Explanation:

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Answer 2

Answer:

Explanationgiven that ,

   1st 30 km uniform speed is (u1) = 40 km/h 

    2nd 30 km uniform speed is ( u2 ) = 20 km/h

    total distance ( d ) = 30 + 30 = 60 km

    time taken in 1st time = d / t = 30/40 also, 3h / 4 = 180/4 = 45 min

    tim taken in 2nd time = d/t = 30/20 also, 3h/2 = 180/2 = 90 min

   total time = 45 + 90 = 135 min = 135/60 h

av.speed = 60/135/60 = 60 * 60 /135 = 26.66 km/h ( answer )    

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