1) A car travels 30km at a uniform speed of 40km/h and the next 30km at a uniform speed of 20 km/h. Find its average speed.
Ans:90km/h
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Explanation:
The total time for the journey is given as,
t=v1d1+v2d2
=4030+2030
=2.25hour
The average speed is given as,
vavg=td1+d2
=2.2530+30
=26.67km/h
Thus, the average speed of the car is 26.67km/h
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