Question

a boy covers a distance of 25 km in 4 hours partly on foot at the rate of 3.5 km / hr and partly on cycle at 9 km /hr . find the distance of covered in foot.​

Answer 1

Answer:

14km

Step-by-step explanation:

d= s*t

=4*3.5=14KM

Answer 2

Answer:

Distance covered in foot is $7$ km.

Step-by-step explanation:

Given, a boy covers a distance of $25$ km in $4$ hours.

He walks partly on foot at the rate of $3.5 km/hr$ and partly on cycle at $9 km/hr$.

Let the time taken on foot be $x$ hr.

The time taken on cycle be $y$ hr.

We know the formula,

$Speed = \frac{Distance}{time}$.

$Distance = speed\times time$.

Given,

$25=3.5x+9y$

Also,

Total time = time travelled on foot + time travelled on cycle.

$4=x+y$

$y=4-x$

Substitute the value of $y$ in $25=3.5x+9y$,

$25=3.5x+9(4-x)$

$25=3.5x+36-9x$

$4.5x=9$

$x=2$

Now finding the value of $y$,

$y=4-2=2$.

Distance covered in foot = $3.5\times 2$

$=7km$

Distance covered in foot is 7 km.