Question
A takes 2 hours more than B to walk D km. If A doubles his speed then he can make it in 1 hour less than B. How much time does B require for walking D km?
Answer: Option C
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Suppose B takes x hours to walk d km
Then A takes (x+2) hours to walk d km
With double of the speed.
A will take ½(x+2)hours
Therefore, x -1/2(x+2) = 1
2x “(x+2)
X =4
Hence B takes 4 hours to walk d km
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