The distance between Pretoria and Cape Town is 1450 km . Plane A and plane B depart from Pretora and Cape Town respectively at the same and fly towards each other. Plane A flies at an average speed of \( 400 \mathrm{~km} / \mathrm{h} \) and plane B flies at an average speed of \( 450 \mathrm{~km} / \mathrm{h} \). What will be the distance between the two planes after 1 hour 30 minutes?

After 1 hour and 30 minutes (which is 1.5 hours), Plane A travels \( 400 \, \text{km/h} \times 1.5 \, \text{h} = 600 \, \text{km} \), and Plane B travels \( 450 \, \text{km/h} \times 1.5 \, \text{h} = 675 \, \text{km} \). Together, they cover a distance of \( 600 \, \text{km} + 675 \, \text{km} = 1275 \, \text{km} \). Therefore, the distance between the two planes after 1 hour and 30 minutes is \( 1450 \, \text{km} - 1275 \, \text{km} = 175 \, \text{km} \). You can visualize the journeys of Plane A and Plane B as two friends running towards each other on a long track. With each passing minute, they are getting closer, and you can almost hear their energetic cheers as they sprint toward their exciting meetup! What better way to think about distance than as a thrilling race?