#!/bin/env python3

def tanken(drives, cost):
    passagers = {}
    distance = 0.

    for d in drives:
        try:
            distance += int(d[0])
        except:
            return None, "Lines have to start with the driven distance!"
        for p in d[1:]:
            if p not in passagers:
                passagers[p] = [int(d[0]),0]
            else:
                passagers[p][0] += int(d[0])
   
    c = cost/distance 

    for d in drives:
        c_d = c * int(d[0]) / (len(d) - 1)
        for p in d[1:]:
            passagers[p][1] += c_d

    return passagers, None