1.

A car travels distance of 60 km at speed of 20 kmph. If covers the next 80 km of its journey at speed of 40 kmph and last 20 km of its journey at speed of 5 kmph. What is average speed of car?

Answer»

17.8 km/h



Time taken in 1st part= 60/20 = 3 hrs
Time taken in 2nd part = 80/40 = 2 hrs
Time taken in 3rd part = 20/5 = 4 hrs 
TOTAL distance = 60 + 80 + 20 = 160 km
Total time= 3 + 2 + 4 = 9 hrs
Therefore, SPEED = 160/9 = 17.8 KMPH



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