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Time, Speed & Distance · Question 23 of 71

Question 23

EasyOriginal question

Two cars start at the same moment from towns 300 km apart and drive towards each other at 55 km/h and 45 km/h. After how many hours do they meet?

Options for question 23

Show the answer and explanation
CorrectNot quiteAnswer B

Correct answer: B

Explanation

  1. Moving towards each other, the gap closes at 55+45=10055 + 45 = 100 km/h.

  2. Time =300100=3= \frac{300}{100} = 3 h.

Worth noting

Using the difference 55−45=1055 - 45 = 10 km/h gives 30 h. Speeds subtract only when the two move in the same direction.

Concept
Relative speed of objects moving towards each other is the sum of speeds
Typical time
35 s
Your time
—
The rule this testsRelative speed
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