Question

a car travels 180 km in 4 hours how long will take to travel 400 km at this speed​

Answer 1

Speed = distance/time
In this case, speed = 180km. And time = 4 hours

So,
180/4
=45 km/hr


So, to find how much time it takes to travel 400km

Therefor, Distance travelled = 400km

Time Taken is 400/45 = 8.8 hrs

Therefore, the car will take 8.8 hours to travel 400km

Answer 2

Answer :-

Given :-

Distance travelled = 180 km

Time taken = 4 hours

To find :-

Time taken to travel 400 km

Solution :-

$\rm Time = \frac{Distance}{speed}$

By using unitary method :-

Time taken to travel 400 km =

$\sf \dfrac{400}{ \dfrac{180}{4} }$

$\sf = \dfrac{400}{45}$

$\sf = 8.8$

Time taken to travel 400 km = 8.8 hrs