A takes 2 hours 30 minutes more than B to walk 40 km. If A doubles hi…

Question

A takes 2 hours 30 minutes more than B to walk 40 km. If A doubles his speed, then he can make it in 1 hour less than B. What is the average time taken by A and B to walk a 40 km distance?

Accepted Answer

Option A. 5 hours 45 minutes. Answer & Solution Answer: Option A Solution: & 40A - 40B = 21/2 = 5/2 . . . . . . . ( i ) & 40B - 402A = 1 . . . . . . . ( ii ) & Equation ( i ) + Equation ( ii ) & 40A - 402A = 5/2 + 1 & 40A - 402A = 7/2 & 402A = 7/2 & A = 407 & Put the value of A in equation ( i ) & 7 - 40B =…