Helppp Convert 240 seconds into minutes.

How many grams of sodium chloride are in 250ml of a 2.5m naci solution

Problem page a jet airplane reaches 846. km/h on a certain flight. what distance does it cover in 13.0 min? set the math up. but don't do any of it. just leave your answer as a math expression. also, be sure your answer includes all the correct unit symbols.

What is the density, d, of a substance with a volume of v = 12.5 cm3 and a mass of m = 74.4 g ?