Mathematics · Speed, Distance and Time
A and B are travelling from point X to point Z, which are 400 km apart. Travelling at a certain speed, A takes 1 hour more than B to reach point Z. If A doubles his speed, he takes 90 minutes less than B to reach Z. What is the difference between the speeds of A and B?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 140 km/h
- 230 km/h
- 320 km/h✓
- 410 km/h
Correct answer
20 km/h
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