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#32335

distance

word problem

inequalities

hard

80 sec

A package sent via standard delivery typically arrives in 60 minutes. An express delivery service guarantees delivery in 20 minutes, but can experience unexpected delays. If $d$ represents the number of minutes of unexpected delay for an express delivery, what is the maximum integer value of $d$ for which the express delivery would be no slower than the standard delivery?

• Up to 5 characters (6 if negative). Only numbers, decimal (.), fraction (/), negative (-).
• Fractions must be in lowest terms.
• Mixed numbers must be converted to improper fractions.