Question

if a car covers a distance of 240km in 4hr, then how long will it take to cover 420km at the same speed?

Answer 1

Step-by-step explanation:

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

Then, st=240⟹s=

t

240

and (s+20)(t−2)=240

(

t

240

+20)(t−2)=240

(20t+240)(t−2)=240t

20t

2

+240t−480−40t=240t

20t

2

−40t−480=0

t

2

−2t−24=0

t

2

−6t+4t−24=0

(t−6)(t+4)=0

t=−4,6

Hence, time is 6 hr

and speed =

6

240

=40km/hr

Answer 2

Answer:- 6hr

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