Car travels a distance of 240 kilometre in 10 hours with the same spee

1.	Car travels a distance of 240 kilometre in 10 hours with the same speed how much time will it take to cover the distance of 300 km.give method
Answer» Let the speed of the car be s and TIME be t Then, st=240⟹s=t240 and (s+20)(t−2)=240 (t240+20)(t−2)=240 (20t+240)(t−2)=240t 20t2+240t−480−40t=240t 20t2−40t−480=0 t2−2t−24=0 t2−6t+4t−24=0 (t−6)(t+4)=0 t=−4,6 Hence, time is 6 hr

Car travels a distance of 240 kilometre in 10 hours with the same speed how much time will it take to cover the distance of 300 km.give method

Answer»

Let the speed of the car be s and TIME be t

Then, st=240⟹s=t240

and (s+20)(t−2)=240

(t240+20)(t−2)=240

(20t+240)(t−2)=240t

20t2+240t−480−40t=240t

20t2−40t−480=0

t2−2t−24=0

t2−6t+4t−24=0

(t−6)(t+4)=0

t=−4,6

Hence, time is 6 hr