A ship traveled halfway to its destination at 18 knots and then increased its speed to 22 knots for the rest of the voyage. If the second half of the trip was completed in 2 hours 30 minute hours less, how far did it travel at 18 knots? How far was the voyage?

Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of