Question

A car Covers1/3 part of total distance with a speed of 20km/h and a remaining distance with a speed of 44 km/h. Find its average speed?
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Answer 1

Answer:

Explanation: 31.43 km/hr

avg speed = total dist / total time taken

here distance is not mentioned, so we can assume the distance.

let the distance = 440 km

time1 taken to cover 1/3 rd of the total distance = ( 1/3 x 440 ) ÷ 20 = 22/3 [ t = distance / speed ]

time2 taken to cover the remaining distance = ( 2/3 x 440 ) ÷ 44 = 20/3

total time = (22+20)/3 = 42/3 = 14

avg speed = 440 ÷ 14

= 31.43 km/hr

(you can assume any distance, the avg speed will be the same )