Train A takes 45 minutes more than train B to travel a distance of 675 km. Due to engine trouble speed of train B falls by a quarter, so it takes 30 minutes more than train A to complete same journey. What is the speed of train A (in km/h)?
(a) 150
(b) 125
(c) 100
(d) 75
Sol:
∴ train(A) = 225 min + 45 min = 270 min = 4.5 hr
∴ speed of train (A) = 675/4.5= 150 km/h
