phour.py

# Calcurate km/h from distance (km) and duration (mm:ss) to manage your workout.
#
# Usage:
#   python phour.py 2.62 20:28
#   >> 7.68 km/h
#
from sys import argv

distance = argv[1]  # 2.62 km
duration = argv[2]  # 20.28 m

m, s = duration.split(':')
h = (int(m) + int(s)/60)/60
phour = round(float(distance) / h, 2)
print(f"{phour} km/h")