A car travels a certain distance taking 7 hrs in forward journey, during the return journey increased speed 12km/hr takes the times 5 hrs.What is the distance travelled

2 Answers on this Question

1. 12kms = 5 hrs then, 7hrs ?
   so 7hrs = 16.8 kms

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2. Let d = 7r. And use distance is = rate × time
   7r= ( r+12) 5
   7r= 5r + 60
   Subtract 5r from both sides
   2r = 60
   Divide out 2
   Rate = 30 km/h
   Original question 30 km/h × 7 = 210
   30 +12 = 42× 5 = 210

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