A person crosses a road 350 metres wide in 70 seconds. His speed (in km/h) is:
- A18
- B17
- C19
- D15
Solution & Step-by-step Explanation
Given:
Distance (d) = 350 metres
Time (t) = 70 seconds
First, calculate the speed in metres per second (m/s):
Speed=
Time
Distance
=
70
350
=5m/s
To convert the speed from m/s to kilometers per hour (km/h), we multiply by
5
18
:
Speed in km/h=5×
5
18
=18km/h
Distance (d) = 350 metres
Time (t) = 70 seconds
First, calculate the speed in metres per second (m/s):
Speed=
Time
Distance
=
70
350
=5m/s
To convert the speed from m/s to kilometers per hour (km/h), we multiply by
5
18
:
Speed in km/h=5×
5
18
=18km/h