- 250 km
- 300 km
- 400 km
- 350 km

Option 4 : 350 km

Distance covered by train P in 50 min = 60 × 50/60 = 50 km

⇒ Remaining distance = 700 - 50 = 650 km

Time taken by trains to cross each other = 650/(60 + 70) = 5 hr

∴ Distance from A = 5 × 70 = 350 km
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