dolly drives her car at uniform rate of 40km/h for 2 hours on a straight line and then at the rate of 70km/h for 1 hour calculate her average speed for the entire journey.
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40km for 2 hour and 70km for 1 hour
Therefore we can write 40+40+70/3for 3
Hour journey. After solving it we will get 50
Therefore we can write 40+40+70/3for 3
Hour journey. After solving it we will get 50
Answered by
4
Answer:
13.9m/s
Explanation:
Constant speed of 40km/h for 2 h =40+40=80km
Constant speed of 70km/h for 1 h=70 km
Total distance =( 80+70) km=150km
Total time =3h
average speed=total distance travelled/ total time
=150/3=50km/h
converting it to m/s=50×5/18=250/18=13.9m/s
ans = 13.9m/s
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