Added Tortoise_Racing.py

CodeWars/Tortoise_Racing.py

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+'''URL :  https://www.codewars.com/kata/55e2adece53b4cdcb900006c '''
+'''
+Question
+
+Two tortoises named A and B must run a race. A starts with an average speed of 720 feet per hour. Young B knows she runs faster than A, and furthermore has not finished her cabbage.
+
+When she starts, at last, she can see that A has a 70 feet lead but B's speed is 850 feet per hour. How long will it take B to catch A?
+
+More generally: given two speeds v1 (A's speed, integer > 0) and v2 (B's speed, integer > 0) and a lead g (integer > 0) how long will it take B to catch A?
+
+The result will be an array [hour, min, sec] which is the time needed in hours, minutes and seconds (round down to the nearest second) or a string in some languages.
+
+If v1 >= v2 then return nil, nothing, null, None or {-1, -1, -1} for C++, C, Go, Nim, [] for Kotlin or "-1 -1 -1".
+'''
+
+#ANSWER
+
+def race(v1, v2, g):
+    if v1 >= v2: return None
+    t = float(g)/(v2-v1)*3600
+    mn, s = divmod(t, 60)
+    h, mn = divmod(mn, 60)
+    return [int(h), int(mn), int(s)]