Question

A train travels the first 80km of its journey at an average speed of 60km/h.what must be its average speed over the remaining 50km/h in order that the average speedover the whole journey may be 70km/h

Answer 1

Answer:

These systems use continuous tubes called xylem and phloem. Xylem carries water and minerals from the roots to the leaves while Phloem carries sugar & other organic nutrients made by plant from the leaves to the rest of the plant. Xylem vessels have a thick, strengthened cellulose cell wall with a hollow lumen.y the next few days and I am a little bit of a new one and only if necessary

Explanation:

These systems use continuous tubes called xylem and phloem. Xylem carries water and minerals from the roots to the leaves while Phloem carries sugar & other organic nutrients made by plant from the leaves to the rest of the plant. Xylem vessels have a thick, strengthened cellulose cell wall with a hollow lumen.