Answers

2015-07-28T13:29:47+05:30
Answer is 6 kms. It's pretty easy to solve the sum. 
Assume the total distance as x km. 

Then, total time = 84 minutes = \frac{7}{5} hours

Two thirds of the distance = \frac{2x}{3} km, similarly the rest of the distance = 1-\frac{2x}{3} = \frac{x}{3} km. 

Now, according to question, 

\frac{\frac{2x}{3} }{4} + \frac{\frac{x}{3}}{5}  = \frac{7}{5}
On solving the value of x from the above equation, the value is 6 km. 

Thanks. 
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2015-07-28T17:19:45+05:30
Take total distance= x km

total time=84/60=7/5hr

two thirds of D=2x/3
the rest of the distance =x/3
 

Now, ATQ 

(2x/3*1/4)+(x/3*1/5)=x
If you solve this till end, you will get ans as 6km
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