a man had walk a certain distance.he covered two thirds of it at 4 kmph and the remaining at 5 kmph.if the total time taken is 42 minutes,find the total distance.
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Answer:
3 km
Step-by-step explanation:
Let the distance be 'x' km.
Therefore total time taken = (2x/12)+(x/15) hr = 42 min
=> (2x/12)+(x/15)=(42/60)
=> (10x+4x)/60=(42/60)
=> 14x=42
=> x = 3 km
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