28. A car travels half of the length of straight line
motion with a speed of 60 km/h. The remaining
part of the distance is covered with speed
40 km/h for half of the time of remaining journey
and with speed 20 km/h for the other half of the
time. The average speed of the car for the entire
journey is
(1) 30 km/h
(2) 40 km/h
(3) 48 km/h
(4) 45 km/h
Answers
Answered by
1
Answer:
the average speed will be 30km/h
Answered by
1
Answer:
Average speed will be 37.03 m/sec
Which is not given in all option
Explanation:
Let the total distance is d
It is given that car travel half of the distance with the speed of 60 km/hr
So time taken to cover half of the distance
Remaining distance
Now half of the remaining distance is traveled by speed of 40 km/hr
So time taken to cover this distance
After that remaining distance is traveled by 20 km/hr
So time
So total time
We know that average speed
So average speed will be 37.03 m/sec
Which is not given in all option
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