A rectangle has a length of 9 and a width of 4. What is its area?

Area = length × width = 9 × 4 = 36.

If a train leaves at 2:45 PM and arrives at 6:15 PM, how long is the trip?

From 2:45 to 6:15 is 3 hours and 30 minutes.

(12 + 18 + 24) ÷ 3 = 54 ÷ 3 = 18.

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Two numbers add up to 20 and their difference is 4. What is the larger number?