Description for Correct answer:
Let speed of 1st train be 8 x

and speed of 2nd train be 9 x.

According to the question,

Speed of second train = \( \Large \frac{360}{4} \) = 90 km/h

9x = 90 = x = 10

So, speed of 1st train = \( \Large 8 \times 10 \) = 80 km/h

Therefore, Required distance = \( \Large 80 \times 3 \) = 240 km