A car travels with a speed 60 km/h during the first half time and with a speed 80km/h during the second half Time.calculate the average Speed?
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70
Explanation:
1st half:
speed of the car : 60km/h
time will 't' says
velocity : speed*time
60*t=60t
2nd half:
speed of the car :80 km/h
time will be 't' says
velocity =speed*time
80*t=80t
average speed of the car=distance/time
80t+60t/2t
(2t=1sthalf +2nd half time)
140/2t
=70
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