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A man travels 600 km by train at 80 k...

A man travels 600 km by train at 80 km/hr, 800 km by ship at 40 km/hr, 500 km by aeroplane at 400 km/hr and 100 km by car at 50 km/hr. What is the average speed for the entire distance? a. `60\ k m//h r` b. `62\ k m//h r` c. `60 5/(123)` `k m//h r` d. `6 5/(123)k m//h r`

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