Question

.. An airplane flies for 3 hours with a constant speed of 672 km/h and then for
another 2 hours with a constant speed of 588 km/h. What is its average speed
for the total trip?​

Answer 1

Answer:

624.4 km/h

describe:

S=d/t

for first 3 hours it travels

672=d/3

d=672×3=1946

for 2 hours it travels

588=d/2

d=588×2=11766

total distance covered in whole trip = d1 +d2 =1946+1176=3122

total time for whole trip =3+2=5 hours

so av. speed for total trip =

S=total distance/total time

s=3122/5=624.4

av. speed =624.4 km /h