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Both the car and van set off at the same time.

The car took 1.5 h to travel from Gem Market to the mid-point between Gem Market and Town B. So it must have also taken 1.5 h to travel from the mid-point to Town B. It reached Town B at 1130.

The van took 2.5 h to travel from the mid-point between Gem Market and Town B to Gem Market. So it also took 2.5 h to travel from Town B to the mid-point between Gem Market and Town B. Therefore, the van set off at 0730.

That means the car left Town A at 0730. The car took 1 hour to travel 120 km. Its speed was 120 km/h.

The car took 3 hours to travel from Gem Market to Town B. So the distance is 120 × 3 = 360 km.

The van took 5 hours to travel from Town B to Gem Market. Its speed was 360 ÷ 5 = 72 km/h.

Difference in speed = 120 – 72 = 48 km/h.

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