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Q.

I walk from my house to my office at a speed of 3 km/hr and arrive at the office 20 min. late, but when I walked at 4 km/hr. I reached the office 15 minutes before time, the distance between my house and office is 

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a

6 km

b

7 km

c

8 km

d

9 km

answer is B.

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Detailed Solution

Formula :D=S×T

Speed =3 km/hr

Time=T+13hr

Speed=4km/hr

Time=T−14hr

3T−14=4T−14

3T+1=4T−1

∴T=2hours

∴D=32+13

=373

=7km

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