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Question-168264

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Question Number 168264 by Mastermind last updated on 07/Apr/22
Answered by som(math1967) last updated on 07/Apr/22
let speed =xkm/hr ∴((240)/(x−4)) −((240)/x)=2 ⇒240{((x−x+4)/(x(x−4)))}=2 ⇒((240×4)/(x^2 −4x))=2 ⇒x^2 −4x−480=0 ⇒x^2 −24x+20x−480=0 ⇒(x−24)(x+20)=0 x=24 speed=24km/hr
letspeed=xkm/hr∴240x−4−240x=2⇒240{x−x+4x(x−4)}=2⇒240×4x2−4x=2⇒x2−4x−480=0⇒x2−24x+20x−480=0⇒(x−24)(x+20)=0x=24speed=24km/hr

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