If a plane travels at an average velocity of 900 km/hr, it is 531 km from Harlingen to Houston, and 7798 km from Houston to London, how long will it take to fly from Harlingen, TX to London, UK? (You can ignore the time spent in the airports, taking off, landing, etc.)

A., d., and f i think

The density of the block of iron is lees than the density of mercury but the density of the block of iron is greater than the density of water

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.