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RRB NTPC 2014 Paper

Question : 84 of 100

Marks: +1, -0

Solution:

(2) Let the distance between Ram's house and office be d km. Now,Time taken to travel the distance at5 km/h =

\frac{d}{4}

Time taken to travel the distance at 5 km/h =

\frac{d}{5}

Difference between the times taken= 10 + 5 = 15 minutes

15 minutes =

\frac{15}{60} = \frac{1}{4}\text{h}

According to the question,

\frac{d}{4}-\frac{d}{5}=\frac{1}{4}\Rightarrow\frac{d}{20}=\frac{1}{4}\Rightarrow d=5\text{ km}

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