Train A takes 35 minutes more than train B to travel a distance of 460 km. Due to engine trouble speed of train B falls by a quarter, so it takes 30 minutes more than train A to complete the same journey. What is the speed of train A (in km/hr)?
a) 110
b) 90
c) 115
d) 120
Sol:
Time for train A = 195 + 35
= 230
3 hr. 50 min.
Speed of train A =
=460*6/23
= 60 × 2
= 120 km/h.
