Two runner start running together for a certain distance, one at 5 km/h and another at 8 km/h. The former arrives one and half an hour before the latter. The distance in Km is :

A) 12 km B) 20 km C) 25 km D) 36 km

Answer & Solution

Correct Answer: Option B

$$\eqalign{ & \text{Let }x\text{ be the distance, then} \cr & \frac{x}{5} - \frac{x}{8} = \frac{3}{2} \cr & \Rightarrow \frac{8x - 5x}{40} = \frac{3}{2} \cr & \Rightarrow \frac{3x}{40} = \frac{3}{2} \cr & \therefore x = 20\,{\text{km}} \cr} $$

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3 Comments

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Naresh Chamoli 6 years ago

Their is change in values instead of 5kmph it is 8 and for 3kmph it is 5 rest is same....and this solution is wrong they just copied it from....supporting material

Mithun Chakraborty 8 years ago

perhaps, it's a typing mistake.

Jyoti Chothwani 9 years ago

Another one runs at speed of 3 km/h and not at 8 km/h.

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Two runner start running together for a certain distance one at...

Two runner start running together for a certain distance, one at 5 km/h and another at 8 km/h. The former arrives one and half an hour before the latter. The distance in Km is :

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