Question

SPEED ,DISTANCE AND TIME
A WOMEN CAN WALK A CERTAIN DISTANCE IN 84 MIN . IF SHE COVERED TWO THIRD IN A SPEED OF
4 KM /HR AND THE REST IN 5 KM/HR, FIND THE TOTAL DISTANCE COVERED.
PLEASE ANSWER BY TODAY ITSELF
THANK YOU

Answer 1

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. 

Answer 2

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