Question

The distance covered at a particular time by two drivers are given in the table below.


Which of the following gives their speed?

• A. 15 m/s, 20 m/s
• B. 20 m/s, 25 m/s
• C. 30 m/s, 35 m/s
• D. 25 m/s , 30 m/s

Answer 1

The correct option is B 20 m/s, 25 m/s

Driver 1 covers 2,500 m in 125 s.

Speed = $\frac{Distance}{Time}$ = $\frac{2500}{125}$


$$\begin{array}{c}20\\ 1252500\\ -\underset{–}{250}-2\\ 000\\ -\underset{–}{0}0\\ 0\end{array}$$
Therefore, speed of Driver 1 is 20 m/s.

Driver 2 covers 2800 m in 112 s.

Speed = $\frac{Distance}{Time}$ = $\frac{2800}{112}$

$$\begin{array}{c}25\\ 1122800\\ -\underset{–}{224}-2\\ 5600\\ -\underset{–}{560}0\\ 0\end{array}$$

Therefore, speed of Driver 2 is 25 m/s.

Hence, the speed of the two drivers are 20 m/s and 25m/s.