Train A takes 45 minutes more than Train B to travel a distance of 450 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)?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 ie 100.
Let the speed of Train A be x.
Speed of Train B = y
x.t = y.[t - (3/4)] - eq1
Given,
x.t = y.[t + (1/2)] - eq2
On solving equation,
1 part = 75 minutes [time difference]
Time by A = 4.5 hrs, distance = 450km
Speed = 450/4.5 = 100km/hr