Question

Please answer me I will give brainliest answer if it is correct​

Answer 1

Answer:

36 kmph

Step-by-step explanation:

distance =180 , let speed =X

time = 180/X

now dist=180, speed = X+9

time =180/(X+9)

as per question

t1 -1 =t2

(180/X) -1 = 180/ (X+9)

(180-X)(X+9) = 180X

X²+9X-1620=0

X= 36, -45(unacceptable)

hence

X=36 kmph

proof:

if speed 36 then time = 180/36 =5 hr

if speed 36+9=45 then time = 4 hr