IOM 2020, Блиц — Задача 39

The Blitz-contest of IOM-2020

Условие

You drive a boat on the river upstream from point $A$ to point $B$ and back downstream from $B$ to $A$ and the trip takes $t_1$ seconds. When you drive the same boat the same straight distance ($A - B - A$) on a still lake the trip takes $t_2$ seconds. Calculate the ratio $t_1/t_2$ if the speed of the river is 2 km/h and the speed of the boat (regarding the still water and the river) is 5 km/h.

The answer should be given in the SI units unless otherwise stated. If the numerical result turns out to be an integer, it should be given as the answer. Otherwise round the result to the first decimal.

Отговори

Решение

---

Оригинал в Архива: iom-2020-blitz-tasks.pdf · официални решения: iom-2020-blitz-answers.pdf