You are given a mathematical question described with an open-ended vocabulary. Questions in this task involve real-world situations, describing a mathematical problem. You are also given 4 or 5 answer options (associated with "A", "B", "C", "D", "E"). Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D', 'E'. LaTeX mathematical format (the standard way to express mathematical expressions in the typesetting software known as LaTeX) is used to express equations. Each question is solvable with high school math knowledge. Give only one answer for each question.

A train takes one hour longer to travel d miles at its normal speed than it would if it were traveling 10 miles faster. Which of following equations could represent the equation to find the train's normal speed \(s\), in miles per hour?
(A)\(\frac { d } { s + 10 } = s + 1\) (B)\(\frac { d } { s } = \frac { d } { s + 1 } \) (C)\(\frac { s } { s + 10 } = d\) (D)\(\frac { d } { s + 10 } - \frac { d } { s } = 1\) (E)\(\frac { d } { s } - \frac { d } { s + 10 } = 1\)
E

A certain box contains only black, blue, and red pens. If a pen is chosen at random from the box, the probability of choosing a black pen is \(\frac { 1 } { 4 } \) and the probability of choosing a blue pen is \(\frac { 1 } { 6 } \). What is the probability of choosing a red pen?
(A)\(\frac { 1 } { 24 } \) (B)\(\frac { 1 } { 12 } \) (C)\(\frac { 7 } { 12 } \) (D)\(\frac { 3 } { 4 } \) (E)It depends on the number of pens in the box.
C

A new airplane can travel at speeds up to 4,680 miles per hour. Assuming that the airplane is traveling at top speed, how many miles can it travel in 10 seconds?
(A)1.3 (B)7.8 (C)13 (D)78 (E)130

C