Peter drives a car and covers x miles in h hours and covers next y miles in next h hours. What is the average speed of his car?
  1. (x-y)/2h
  2. 2(x+y)/h
  3. 2(x+y)/2h
  4. (x+y)/2h
Explanation
Answer D- Speed = Total distance / Total time = (x+y)/ (h+h) = (x+y)/ 2h

Key takeaway:
In speed, distance and time problem, work out the total distance travelled and the time taken.
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