Two trains, A and B, are each 200 m long and are moving in opposite directions. They cross each other in 16 seconds. What is the speed of train A?
A
90 km/h
B
40 km/h
C
80 km/h
D
Insufficient data
Correct Option:
D
Explanation
Together, the trains cover 200 + 200 = 400 m in 16 seconds, so their relative speed is 400/16 = 25 m/s = 90 km/h. But that is A's speed + B's speed, not A's individual speed. Without B's speed, A cannot be found. This is a classic trap: option (1) gives the relative speed.
