Question

(ii) If the speed of
car is decreased by 12 km/h, it takes 1 hour more to cover a
distance of 240 km. Find the original speed of the car.​

Answer 1

Answer:

original speed 60km/hr

Step-by-step explanation:

Given,

If the speed of  car is decreased by 12 km/h, it takes 1 hour more to cover a

distance of 240 km.

here distance=240 km

let original speed is x

if it decreased by 12 is (x-12) it will take more hour

240/(x-12)-240/x=1

240x-(x-12)*240=(x-12)x

2880=x^2-12x

x^2-12x-2880=0

x^2-60x+48x-2880=0

x(x-60)+48(x-60)=0

(x-60)(x+48)=0

x=60 km/hr