Added a warm-up

Misc/Warm-Ups/strings.tex

@@ -0,0 +1,30 @@
+\documentclass[
+	solutions,
+	hidewarning,
+	singlenumbering,
+	nopagenumber
+]{../../resources/ormc_handout}
+\usepackage{../../resources/macros}
+
+
+
+\title{Warm-Up: Fuse Timers}
+\subtitle{Prepared by \githref{Mark} on \today.}
+
+\begin{document}
+
+	\maketitle
+
+
+	\problem{}
+	Suppose we have two strings and a lighter. Each string takes an hour to fully burn. \par
+	However, we do not know how fast each part of the string burns:
+	half might burn in 1 minute, and the rest could take 59.
+
+	\vspace{2mm}
+
+	How would we measure exactly 45 minutes using these strings?
+
+	\vfill
+
+\end{document}