SOLUTION: A motor cycle covers 40 km with a speed of 20km /h find the speed of the motor -cycle for the next 40 km journey so that the average speed of the whole journey will be 30 km /h

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Question 1068642: A motor cycle covers 40 km with a speed of 20km /h find the speed of the motor -cycle for the next 40 km journey so that the average speed of the whole journey will be 30 km /h
Answer by josgarithmetic(39630)   (Show Source): You can put this solution on YOUR website!
                  SPEED        TIME               DISTANCE

First part          20                         40

Next part           r                          40

Total                                     80


Average speed wanted 30 kilometer per hour.


Simplify and solve this for r.







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