A car is moving on a straight road covers one third of the distance with a speed of 20 km/h and the rest with
a speed of 60 km/h. The average speed of the car is
(1) 40 km/h
(2) 50 km/h
(3) 36 km/h
(4) 55 km/h
Answers
Answered by
4
Answer:
3. 36km/h
Explanation:
Let the total distance be x
From question,
(1/3)x was traveled at 20km/h
(2/3)x was traveled at 60km/h
The time for the first part = (x/3)/20
= x/60
The time for second part = (2x/3)/60
= x/90
Total time = x/60+x/90
= x/36
Using the equation: Speed= Distance/Time
We then calculate the speed.
S=x/(x/36)
S = 36km/h
Answered by
2
36KM/H
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