Question

Neelam covers a distance of 200km in her car in 3 hours. Find the speed at which she is
driving the car.

Answer 1

Answer:

Speed=Distance/Time

=200/3

=66.67km/h

Answer 2

Speed of the car =x km /hr

Time taken =t hrs

xt=200

∴t=x200

Now, (x+5)(t−2)=200

(x+5)(200/x-2) =200

(x+5)(200−2x)=200x

200x−2x2+1000−10x=200x

x2+5x−500=0

x2+25x−20x−500=0

(x+25)(x−20)=0

x=−25,x=20

Speed cannot be negative value, hence, x=20 km/hr