Question

If the speed increases by 9 km then time decreases by 3 hours and if the speed decreases by 6 km/hr then time increases by 3 hour. Construct 2 equations

Answer 1

let speed be x km/h

& let time be y h

we know that dist=speed*time

A/q

(x+9)(y-3)=xy

xy-3x+9y-27=xy

-3x+9y-27=xy-xy

-3x+9y=27

-x+3y=9 eq(1)

now,

(x-6)(y+3)=xy

xy+3x-6y-18=xy

3x-6y=18

x-y=6 eq(2)