Question

if a car increases speed by 10 km per hour then its takes 36 minutes less to cover a distance of 72 kilometre find the original speed of the car​

Answer 1

if a car increases speed by 10 km per hour then its takes 36 minutes less to cover a distance of 72 kilometre find the original speed of the car?????

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let original speed is 's';

so ,(72/s-72/(s+10))=36/60

on soliving..

s(s+10)=1200

i.e s=30 kmph

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Answer 2

Step-by-step explanation:

let speed be X

uniform speed=72/X.........1

increased by 10=72/10-x.........2

from 1 and 2

72/X + 72/10-x=36

72(10-x)+72x/10x-x^2=36

720-72x+72x=36(10x-x^2)

720=360x-36x^2

36x^2-360x+720=0

(after reducing)

12x^2-120x+240=0

next to do formula method for factorization

36x^2-360