Two boys start from the same place walking at the speeds of 5.5km/h and 3.5km/h, respectively, in the same direction. What time will they take to be 8.8km apart?
- A4.4 h
- B4 h
- C4.2 h
- D4.8 h
Solution & Step-by-step Explanation
Since both boys are moving in the same direction, their relative speed is the difference between their individual speeds:
Relative Speed=5.5km/h−3.5km/h=2km/h
The required distance between them is 8.8km.
The time taken to create this gap can be calculated using the formula:
Time=
Relative Speed
Distance
Time=
2
8.8
=4.4hours
Relative Speed=5.5km/h−3.5km/h=2km/h
The required distance between them is 8.8km.
The time taken to create this gap can be calculated using the formula:
Time=
Relative Speed
Distance
Time=
2
8.8
=4.4hours