A train covers a distance of 480km at a uniform speed. If the speed had been 8km/h less, then it would have taken 3 hours more to cover the same distance. Find the usual speed of the train. This question is from Quadratic equation. Plzz solve it i will mark brainlist
MUKESHAMBANI2002:
hjiiii. mansi
hello
get lost
Answers
Answered by
1
distance =480 km
let the usual speed of the train be x kmph
so the time taken to cover in x kmph = 480/x
now if the speed is reduced by 8 i.e (x-8) kmph so time=480/(x-8)
now the time is 3 hr more , so the equation is
480/(x-8) - 480/x =3
by solving we get the equation as x^2 -8x -1280
you solve it by using formula and get the value of x which is +ve i.e x=40
so the usual speed =x kmph = 40kmph (kilometer per hour)
let the usual speed of the train be x kmph
so the time taken to cover in x kmph = 480/x
now if the speed is reduced by 8 i.e (x-8) kmph so time=480/(x-8)
now the time is 3 hr more , so the equation is
480/(x-8) - 480/x =3
by solving we get the equation as x^2 -8x -1280
you solve it by using formula and get the value of x which is +ve i.e x=40
so the usual speed =x kmph = 40kmph (kilometer per hour)
Hey whats the meaning of ^ this sign?
^ means to the power of any num
Answered by
0
hope it will help you..
Attachments:
Similar questions