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

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.