Question

If the speed of a car is increased by 10km/hr, it takes 1 hour less to cover a distance of 300km then find the original speed of the car

Answer 1

Answer:

DISTANCE = 300 KM

LET , SPEED = X

SO, 300/X - 300/X+10 = 1

===> 300X+3000-300X / X²+10X = 1

==> 3000 = X²+10X

==> 0 = X²+10X-3000

==> 0 = X²+60X-50X-3000

==> X(X+60)-50(X+60)

==> (X+60) (X-50)

==> X = -60;50

SO, SPEED = 50 KM/H