Free GMAT Practice Question

Two towns, $P$ and $Q$, lie $360$ kilometres apart along a straight road. A bus leaves town $P$ at $8{:}00$ and travels towards town $Q$ at a constant $40$ kilometres per hour. A van leaves town $Q$ at $10{:}00$ the same morning and travels towards town $P$ along the same road at a constant $60$ kilometres per hour. When the bus and the van pass each other, how many kilometres from town $P$ are they?