1.

If a car travels a distance of 300 km in 8 hours, partly at a speed of 40 kmh"' and partly at 30 kmh"1, what is the distance it travelled at the speed of 40 kmh"' ?

Answer»

240 km



Let the DISTANCE TRAVELLED at 40 kmh-1 = X km
∴ distance travelled at 30 kmh-1 = 300 - x
∴ 300/8 = 300/x/40 + (300-x)/30
∴ x/40 + (300-x)/30 = 8
= 3X + 1200-4x/120 = 8 = 1200 - x = 960


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