- 70 km
- 30 km
- 50 km
- 80 km

Option 1 : 70 km

The speed of the train A = 50 km/hr

The speed of the train B = 40 km/hr

Given, the distance between two trains initially =200 km

Distance traveled by Train A in 3 hours = 50 × 3 = 150 km

Distance traveled by Train B in 3 hours = 40 × 3 = 120 km

After 3h, what will be the distance between these two trains = Distance travelled by Train A + Distance travelled by Train B - Distance between the trains initially

= 150 + 120 - 200

= 270 - 200

= 70 km

Hence,** "70 km"** is the correct answer.

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