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From 9.30 am to 12.30 pm, Mr Lim travelled 3 h x 60 km/h = 180 km.

3/7 = 180

4/7 = 180/3*4 = 240

Mr Chua travelled 240 km in 2.5 hours. So his speed is 96 km/h.

At 12.30 pm, he reduced his speed by 24 km/h to 72 km/h.

180 km ÷ 72 km/h = 2.5 h

12.30 pm + 2 h 30 min = 3 pm

Mr Chua reached Town X at 3 pm.

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thank you very much…

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