A plane travels 350 km south along a straight path with an average velocity of 125 km/h to the south. The plane has a 30 minute layover, and the travels 220 km south with an average velocity of 115 km/h to the south. What is the average velocity for the trip?

110 km/hr

Explanation:

Average velocity can be determined by

V = S/T

where,

V=Average Velocity

S = Total Displacement traveled

T=Total time taken

A plane travels 350 km south with an average velocity of 125 km/h

v = 125 km/h

displacement 's' = 350 km

therefore, time = 350/125 = 2.8 hours.

then travels 220 km south with an average velocity of 115 km/h

v = 115 km/h

displacement 's' = 220 km

therefore, time = 220/115 ≈ 1.91 hours.

Total time will be:

T = 2.8 + 0.5 + 1.9

T=5.21 hours.

Total displacement of the plane is

s = 350 + 220

s=570 km

Therefore,

V = S / T

V = 570 / 5.21

V = 110 km/hr

Thus, the average velocity for the trip is 110 km/hr towards south