A man takes 1 hour to reach his office which is 10 km from his home. I f he wish to reach his office in 40 min, he must walk with a speed of?
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Answer:
15 km/h
Explanation:
let time taken be 1
distance covered 10
speed = 10km/h
new time = 40 min
= 2/3
distance = 10
new speed = 10×3/2
= 15 km/h
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