SOLUTION: A motorist travels at an average speed of 110km/h for 2 hours. He then travels at an average speed of 98km/h for 2.5 hours. Calculate his average speed over the whole distance?

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Question 967791: A motorist travels at an average speed of 110km/h for 2 hours. He then travels at an average speed of 98km/h for 2.5 hours. Calculate his average speed over the whole distance?
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
D=RT
D=100*2
D=200
D=98*2.5
D=245
200+245=R(2+2.5)
445=4.5R
R=445/4.5
R=98.89 KPH. ANS.