A person X started 3 hours earlier at 40 km/h from a place P, then another person Y followed him at 60 km/h. started his journey at 3 O’clock afternoon.
At what time the difference between X and Y was 30 km, but before Y overtakes X?

1)6:30 pm

2)7:30 pm

3)8:75 pm

4)none of these

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    7:30 pm

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