Question P6 Same time, same distance
Today’s problem — free all day, every step. Every day has one.
Two remote-control race cars, Car A and Car B, started from the same line on a track at 14:00. Both did not change their speed throughout the race. Car A travelled at a constant speed of 36 km/h. When it crossed the finish line at 14:20, Car B was 1.5 km from the finish line. What was Car B's speed?
Answer
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Two travellers spend the same time, or cover the same distance.
In this one. Because both cars raced for the same 1/3 h on the same track, Car B's distance is the full track length minus its remaining gap.
Two travellers set off together or one chases another, with constant speeds and a question about who is ahead, when they meet, or how far apart they are.
Children divide the whole distance by the difference in speed instead of dividing the gap between the travellers, or compare distances covered over different lengths of time.
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