Question

two cars are 225 km away from each other if they travel at a speed of 40 km/hand 25 km/h towards Each Other after how many hours will the cars meet each other​

Answer 1

Speed(s)=distance(d)/time(t)

Let us assume the total distance travelled to be 3x.

So the car travels x distance with each speed.

Since, s=d/t,

t=d/s

So the total time taken would be

T=x/40 + x/50 + x/60

Total distance, D=3x

Avg speed = D/T = 3x/( x/40 + x/50 + x/60 )

Cancel x from numerator and denominator and solve for average speed