Exercise 3 solution (Python)

def naismith(km, ascent_m):
    return km / 5 * 60 + ascent_m / 10

def with_breaks(minutes, per_hour=5):
    return minutes + minutes / 60 * per_hour

legs = [(2.0, 120), (1.5, 0), (3.5, 380)]

total = 0
for km, ascent in legs:
    t = naismith(km, ascent)
    total += t
    print(km, "km,", ascent, "m ascent:", t, "min")

print("Total moving time:", total, "min")
print("With breaks:", round(with_breaks(total)), "min")
print("Distance:", sum(km for km, a in legs), "km; ascent:", sum(a for km, a in legs), "m")

Output:
2.0 km, 120 m ascent: 36.0 min
1.5 km, 0 m ascent: 18.0 min
3.5 km, 380 m ascent: 80.0 min
Total moving time: 134.0 min
With breaks: 145 min
Distance: 7.0 km; ascent: 500 m

So the moving time is 134 minutes (2 h 14 min), about 2 h 25 min with breaks, for 7.0 km and 500 m of ascent.
Check by hand: 7 km is 84 minutes, 500 m of ascent is 50 minutes, 84 + 50 = 134.