Answer if you actually know it i dont need "maybe " or "i think" because i actually want to get my stuff done

The green ivy is the healthiest one. It absorbs every color of light except green, and he gave it every color of light. The blue hydrangea won't survive. It absorbs every color of light except blue, but he didn't give it any other color except blue.

Distance covered = speed x timethe distance traveled going against the stream = distance traveled with the stream.therefore it is the speed and the time that are the variables.as he travels the same distance both ways, speed x time is the same for each way.going upstream his speed is 4 kph; going downstream his speed is 6 kph.therefore we have two simultaneous equations: time upstream x 4 = time downstream x 6time upstream + time downstream = 60 minutestherefore we have the equation: time upstream = 6/10 hour, time downstream therefore = 4/10 hour.distance traveled at 4km/hr in 6/10 hour = 24/10 = 2.4km.check: distance traveled at 6km/hr in 4/10 hour = 24/10 = 2.4km.