A car completes its journey in 10 minutes. For the first half of the distance the speed was 60km/h and for the second half the speed was 40km/h. how far was the journey?
Let the total distance be x. (x/2)/60 + (x/2)/40 = (10minutes)/(60minutes/hour) x/120+x/80 = 1/6 multiply by common denominator 240 2x+3x = 40 5x=40 x=8 km
