excluding stoppages , the average speed of a bus is 75 km / hr and including stoppages , the average speed of the bus is 40 km / hr . for how many minutes does the bus stop per hour ?
n0 = 75.0
n1 = 40.0
t0 = n1 / n0
t1 = 1.0 * 60.0
t2 = t0 * 60.0
answer = t1 - t2
print(answer)