UP Police SI Exam 14 Dec 2017 Shift 2 Solved Paper

Train A, which is going in opposite direction from Train B, goes ahead of it in 54 seconds, which is twice the length of A and is running at half speed from Train A. Train A going in the opposite direction crosses another Train C in 20 seconds, which has twice the speed of Train A. If the speed of Train A is 60 km per hour, then what is the length of Train C?