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Question

A truck travelled the first one-third of the distance d at a speed of 10 kmh1, the second one-third of the distance at a speed of 12 kmh1 and the last one-third of the distance at a speed of 20 kmh1. The average speed of the truck is approximately equal to (in kmh1)
  1. 10
  2. 13
  3. 15
  4. 17


Solution

The correct option is B 13
Using 
 speed= distance travelledtime taken
Time taken to travel first one-third of the distance =d310
Time taken to travel second one-third of the distance  =d312
Time taken to travel last one-third of the distance =d320
Average speed=d3+d3+d3d310+d312+d320
=dd30+d36+d60=36028=12.8 km/h13 km/h

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