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After Lim traveled for 3 hours and at 1230, Lim and Chua passed by each other.

Distance traveled by Lim as 1230 will be,

3hr x 60 km/hr = 180 km

3/7 of the journey –> 180 km

4/7 of the journey –> 180 km/3 x 4 = 240 km

At 1230, Chua traveled 240 km in 2.5 hour, therefore the initial speed will be,

240 km / 2.5 hr = 96 km/hr

Chus’s reduced speed will be,

96km/hr – 24 km/hr = 72 km/hr

Time required to complete 180 km to Town X will be,

180 km / 72km/hr = 2.5 hour.

Ans: Mr Chua will reach town X at 1500 or 3pm.

 

 

 

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