Answers

2014-12-08T21:26:37+05:30
Let.....x be required distance.
x/s=t...........
now
by 1 st condition...
x/25=t+1/15...................................( 4 minutes=1/15 hours)
and by second equation
x/30=t-1/6
from above equations,
x/25 -1/15=x/30 +1/6
so
x=35 km
ans is 35 km


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2014-12-09T11:47:07+05:30
Let distance be x km
Time taken to reach office at 25kmph=(x/25)*60 minutes
Time taken to reach office at 30kmph =(x/30)*60 minute
As per question (x/25)*60-4=(x/30)*60 +10
                          ⇒ (60x-100)/25= 2x+10
                          ⇒  60x -100 = 50x + 250 
                          ⇒ 10x=350
                                   x=35 km

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