River boat ( ) a river boat leaves silver town and travels upstream to gold town at an average speed of 6 kilometers per hour. it returns by the same route at an average speed of 9 kilometers per hour. what is the average speed for the round-trip in kilometers per hour?

a.7.0

b.7.1

c.7.2

d.7.5

e.8.0

Let's suppose the distance between gold town and silver town is 9 kilometers.

The first trip takes 9 km / 6 km / hour = 1.5 hours

The return trip takes 9 / 9 km / hour = 1 hour

TOTAL TRIP = 18 kilometers in 2.5 hours

= 18 / 2.5 = 7.2 hours

Answer is c

Step-by-step explanation:

all the angles opposite to the angle 150 would be 150 and all the angles that are next to 150 are 30 because they equal 180 it you add it up.

step-by-step explanation: