The average speed of a bicycle, an athlete and a car are 18 kmph, 7 ms−1 and 2 km min−1 respectively. Which of the three is the fastest and which is the lowest? [2 MARKS]
Conversion in 1st case: 1 Mark
Conversion in 3rd case: 1 Mark
Let us convert the three given speeds into S.I. unit i.e. ms−1, so that we can compare them.
In the case of:
(i) Speed of the bicycle =18 kmph=18×518=5 ms−1
(ii) Speed of the athelete =7 ms−1
(iii) Speed of the car =2 km min−1=2×100060=33.3 ms−1
So, the car is the fastest and the bicycle is the slowest.