Question
A man travels 600 km by train at 80 km/hr, 800 km by ship a 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 ?
Answer: Option D
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Total distance travelled = ( 600 + 800 + 500 + 100) km = 2000 km.
Total time taken = `(600/80 + 800 /40 + 500/400 + 100/50)` hrs =` 123/4 `hrs.
`:.` Average speed = `(2000 xx 4/123)` km/hr = `8000/123` km/hr = `65 5/123` km/hr.
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