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Solving mathematical problems
Every hour 15km = 0.25km per minute, and every hour 12km = 0.2km per minute.

1: Let the original time be x minutes and the distance be equal.

0.25×(X-24)=0.2×(X+ 15)

X= 180 minutes

The distance is 0.2×(X+ 15)=39 km.

2. Let the distance be x kilometers and the time be equal.

X÷0.25+24=X÷0.2- 15

X=39 km

The original time is 0.2- 15 = 180 minutes.

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