Question

A car moves with a speed of $40km/hr$ for $15minutes$ and then with a speed of $60km/hr$ for the next $15minutes$. The total distance covered by the car is:

• A. $100km$
• B. $25km$
• C. $15km$
• D. $10km$

Answer 1

The correct option is B

$25km$

Step 1: Given

Speed of the car,

$$\begin{gathered} v_1=40km/hr \\ {v}_2=60km/hr \end{gathered}$$

Time, $t=15mins=0.25hours$

Step 2: Determine the distance covered with speed $40km/hr$

$$\begin{gathered} d_1=v_1\times t \\ =40\times 0.25 \\ =10km \end{gathered}$$

Step 3: Determine the distance covered with speed $60km/hr$

$$\begin{gathered} d_2=v_2\times t \\ =60\times 0.25 \\ =15km \end{gathered}$$

Step 4: Determine the total distance covered

$$\begin{gathered} d=d_1+d_2 \\ =10+15 \\ =25km \end{gathered}$$

Therefore, option B is the correct option.