8 kyu - Beginner Series #4 Cockroach.md

Task

The cockroach is one of the fastest insects. Write a function which takes its speed in km per hour and returns it in cm per second, rounded down to the integer (= floored).

For example:

cockroach_speed(1.08) == 30 Note! The input is a Real number (actual type is language dependent) and is >= 0. The result should be an Integer.

Solution

def cockroach_speed(s)
  (s / 0.036).floor
end

Explanation

/0.036 is the conversion calculation needed to change from km/hr to cm/s and .floor rounds down to the nearest integer from a decimal