J, D, L, H and F reach a station at different times. L reaches only after J, and D reaches only before F. Who among them is third to reach?

H is the third person to reach.

'L reaches only after J' means J is first and L is second.

'D reaches only before F' means F is last and D is fourth.

That fixes positions 1, 2, 4 and 5 as J, L, D, F.

The only remaining place, position 3, must be H.

So the third to reach is H.