Question : A speeding car travelling at 40 km/hr decides to slow down to 30 km/hr after covering half the distance. What is the average speed?
Option 1: $30$ km/hr
Option 2: $\frac{120}{7}$ km/hr
Option 3: $\frac{240}{7}$ km/hr
Option 4: $35$ km /hr
Answer (1)
21st Jan, 2024
Correct Answer: $\frac{240}{7}$ km/hr
Solution :
Here $s_1=40$ and $s_2=30$
$\therefore$ Average speed = $\frac{2s_1s_2}{s_1+s_2}=\frac{2×40×30}{40+30}=\frac{240}{7}$ km/hr
Hence, the correct answer is $\frac{240}{7}$ km/hr.
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