সব প্রশ্নে ফিরে যান
Math
A takes 2 hours more than B to walk d km, but 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?
A) d/2 hours
B) 5 hours
C) 4 hours
সঠিক উত্তর
D) 2d/3 hours