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

Question

Question : A man covers half part of a certain distance at 35 km/hr. He covers 40 percent of the remaining distance at the speed of 8 km/hr and covers the rest of the distance at the speed of 18 km/hr. What is his average speed for the entire journey?

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Answer 1

Correct Answer: $\frac{240}{7}$ km/hr

Solution : Here $s_{1} = 40$ and $s_{2} = 30$
$∴$ Average speed = $\frac{2 s_{1} s_{2}}{s_{1} + s_{2}} = \frac{2 \times 40 \times 30}{40 + 30} = \frac{240}{7}$ km/hr
Hence, the correct answer is $\frac{240}{7}$ km/hr.

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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/hrOption 2: 1207 km/hrOption 3: 2407 km/hrOption 4: 35 km /hr

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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