A cyclist covers a distance of 750 m in 2 min 30 sec. What is the speed in km/hr of the cyclist?
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → 18
Speed is distance divided by time. A speed in m/s becomes km/h on multiplying by \(\frac{18}{5}\), because 1 m/s = 3600 m in an hour = 3.6 km/h.
Time in seconds: 2 min 30 s \(=120+30=150\) s
Speed, metres covered each second: \(\displaystyle \frac{750}{150}=5\) m/s
Changed to km/h: \(\displaystyle 5\times\frac{18}{5}=18\) km/h