One bulldozer clears the land twice as fast as another. Together they clear a large tract in 1 2/1 hours. how long would the larger bulldozer take. please tell me how you got it
properly, none of those are expenses according to se, yet listed decrease than are the ratios: 40 8 inches in 4 feet - 12 inches in one million foot $15 for 3 keychains - $5 according to keychain. 80 pages in 5 hours - sixteen pages according to hour.
First, I'm assuming your typo should be 1 1/2 hours (= 1.5 hr). Assume that the large bulldozer takes x hours to clear the land. So in 1.5 hours, by simple proportion, it would clear 1.5/x parts of the land. The small bulldozer is slower by a factor of 2, and takes 2x hours to clear the land. So in 1.5 hours, it would clear 1.5/(2x) parts of the land. But 1.5/x parts of land + 1.5/(2x) parts of land = a total of 1 plot of land. That is : 1.5/x + 1.5/(2x) = 1 Solving gives x = 9/4 = 2 1/4 hours (for the large bulldozer on its own), while, 2x = 9/2 = 4 1/2 hours (for the small bulldozer on its own).
