A motorcyclist travels at 60 km per hour for 2 hours and then 75 km per hour for 4 hours. What is his average speed?

  1. 75 km per hour
  2. 72 km per hour
  3. 70 km per hour
  4. 68 km per hour
Anurag Mishra Professor Asked on 30th April 2016 in Maths.
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1 Answer(s)

Answer: (3) 70 km per hour 

Solution:-
A motorcycle travels at 60 km per hour for 2 hours. 
Then, the covered distance = 60 x 2
 = 120 km

The distance covered by motorcycle in 4 hours with 75 km per hour = 75 x 4  
 = 300 km

Total distance covered by motorcycle = 120 + 300
 = 420 km
Total time taken by motorcycle = 2 + 4
 = 6 hours

Then, the average speed of the motorcycle = 420/6
 = 70 km/hour

Hence, the correct answer is option (3) 70 km per hour.  

Anurag Mishra Professor Answered on 1st May 2016.
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