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Columbus started his journey from Luckno...

Columbus started his journey from Lucknow to Kolkata, which is 200 km, at the speed of 40 km/hr then the went to Bangalore which is 300 km, at the speed of 20 km/hr. Further he went to Ahmedabad which is 500 km, at the speed of 10 km/hr. The average speed of Columbus is :

A

`14(2)/(7)km//hr`

B

`14(5)/(7)km//hr`

C

15.6 km/hr

D

none of these

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