Question

A man travel a distance in 5 hours, the first half at 10 1/2 kmph and the next half at 12 kmph. find the distance

Answer 1

Harmonic mean of velocities where distance is constant:-

2v1v2/v1+v2

let v1=10.5

v2=12

2*10.5*12/22.5

=>11.2 is the average speed

d/t=v

d=t*v

d=11.2*5

d= 56

this is your answer

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Answer 2

Answer:

Total time = 10 hrs. First half - 5hrs , second half - 5hrs. Distance = speed x Time. Total distance = D1 +D2. D1 = 21 x 5 = 105 km. D2 = 24 x 5 = 120 km.

Explanation: