Two dogs are standing 960 m apart from each other. The first dog runs at a speed of 9 m/s and the second runs at 7 m/s. If two dogs run towards each other, after how much time will they bump into each other?
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 60 s
When two objects move towards each other, their relative speed is the sum of their speeds.
Given:
- Distance between dogs = 960 m
- Speed of first dog = 9 m/s
- Speed of second dog = 7 m/s
Relative speed:
$9 + 7 = 16 \text{ m/s}$
Time taken:
$\text{Time} = \frac{\text{Distance}}{\text{Relative speed}} = \frac{960}{16} = 60 \text{ s}$