1.

if the speed of a car is increased by 20 km per hr, it takes 24 minutes less to cover a distance of 48 km. find the speed of the car.​

Answer» ONG>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−6)(t+4)=0

t=−4,6

Hence, time is 6 hr

and speed =

6

240

=40km/hr



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