Question

a car is travelling at a speed of 60km/h takes 15 hours to complete a journey. what will be the time taken to complete the same journey by a train whose speed is 90km/h​

Answer 1

Answer:

It is given that the speed of the car is 60 km/hr and time taken to complete the journey is 15 hours. Let us assume that the distance of the journey is “x km”. Now, to find this distance we are going to use the formula which is the relationship between speed, distance and time.

Speed=

Distance

Time

………. Eq. (1)

Substituting the speed as 60 km/hr, time as 15 hours and distance of the journey as “x km” in the above equation we get,

60km/hr=

x

15 hours

On cross multiplying the above equation we get the value of x as:

(60×15)km=x ⇒900km=x

Now, we have got the distance of the journey as 900 km.

We are asked to find the time taken to complete the distance of 900 km with a speed of 90 km/hr. Let us assume that time taken is “t hours”. Substituting these values of distance, time and speed in eq. (1) we get,

90km/hr=

900km

t

On cross multiplying the above equation we get,

90t=900

Dividing 90 on both the sides of the above equation we get,

t=

900

90

⇒t=10 hours

Hence, 10 hours will be taken to complete the same journey when the car is going with a speed of 90 km/hr.

Answer 2

Answer:

Hence, 10 hours will be taken to complete the same journey when the car is going with a speed of 90 km/hr.