A takes 2 hours more than B to walk d...

A takes 2 hours more than B to walk `d` km, but /it A doubles his speed, then he can make it in hour less than B. How much time does B require for walking `d` `k m ?` `d/2\ hou r s` b. `3\ hou r s` c. `4\ hou r s` d. `(2d)/3hou r s`

` (d)/(2)` hours

3 hours

4 hours

` (2d)/(3)` hours

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