Question

An airplane flies 40km directly south in 10 minutes and 20 km directly east in five minutes, its average speed is:

a)2.98km/min
b)2km/min
c)8km/min
d)4km/min

Answer 1

Average speed = total distance / total time
total distance = 40 + 20 = 60km
total time taken = 10 + 5 = 15 minutes
Average speed = 60/15 = 4km/min

Answer 2

Answer:

D. 4km/min

Explanation:

Since the question deals with "speed" and not "velocity", the direction does not matter.

the plane covers 40 + 20 km=60km in 10mins +5 mins=15mins

60 km - 15 mins

1min- 60÷15= 4 mins

therefore, your answer is D. 4km/min