Problem

TopsOJ Summer 2025 - Guts Round - Problem 13

$A$ , $B$ , and $C$ can each paint $2$ walls in $20$ minutes. $D$ can paint $3$ walls in $10$ minutes. $A$ , $B$ , and $C$ begin painting a $96$ wall house at $5\colon 00$ AM and finish at $9 \colon 00$ AM. $D$ joins $A$ , $B$ , and $C$ at some point between $5\colon 00$ AM and $9 \colon 00$ AM, which is $t$ minutes after $5 \colon 00$ AM.

Find the value of $t$ .

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Category: TopsOJ Summer 2025 Guts Round
Points: 4
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