1 ч - 240,
2ч - 320 (240 * 1 1/3 = 240 * 4/3 = 320),
3 ч - 426 2/3 (320 * 1 1/3 = 320 * 4/3 = 426 2/3),
240 + 320 + 426 2/3 = 986 2/3 - сумма чисел
1 ч - 240,
2ч - 320 (240 * 1 1/3 = 240 * 4/3 = 320),
3 ч - 426 2/3 (320 * 1 1/3 = 320 * 4/3 = 426 2/3),
240 + 320 + 426 2/3 = 986 2/3 - сумма чисел