If a car travels a distance of 300 km in 8 hours, partly at a speed of 40 kmh-1 and partly at 30 kmh-1, what is the distance it travelled at the speed of 40 kmh-1? Pick one.
A) 200 km	B) 210 km	C) 220 km	D) 240 km	E) 250 km
let the distance travelled at 40 kmph=x km   distance travelled at 30 kmph =300-x km   x/40 + (300-x)/30 = 8   x = 240   ANSWER:240 km
<result>D</result>
If a car travels a distance of 300 km in 8 hours, partly at a speed of 40 kmh-1 and partly at 30 kmh-1, what is the distance it travelled at the speed of 40 kmh-1?