Question 272869
How do I write and solve an equation for c mows the lawn three times faster than j. How long will it take to finish the job? (do you need the acerage? It would be 2)
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3 times faster means it takes 1/4 as long, or j takes 4 times as long.
c takes t hours means c does 1/t of the job per hour.
j takes 4t hours means j does 1/4t per hour.
Toghether, 1/t + 1/4t = 5/4t of the job per hour.
--> 4t/5 hours together.
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PS  3 times faster is 4 times as fast. If someone says it's 3 times as fast, ask how much faster is "1 times faster?"  
If 1 times faster is 1x the speed, why would it say "faster?"