walking with 4 / 5 of my usual speed, i miss the bus by 7 minutes. what is my usual time?  Choose the correct choice from the following answers.
A) 16 min  B) 26 min  C) 28 min  D) 20 min  E) 12 min
<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">7 / (5/4)</gadget>
<output>28/5 = around 5.6</output>

<gadget id="calculator">(28/5) * 5</gadget>
<output>28</output>

<result>C</result>
walking with 4 / 5 of my usual speed, i miss the bus by 7 minutes. what is my usual time?
multiply(divide(7, divide(5, 4)), 5)
"speed ratio = 1 : 4 / 5 = 5 : 4 time ratio = 4 : 51 - - - - - - - - 7 4 - - - - - - - - - ? è 28 answer : c"