Question

A flight moving with an average speed of 800 km/h took 4 hours to complete a trip. On its return trip, it took 5 hours to reach its destination due to bad weather. Find the change in the speeds of the flight.
$distance = speed \: \times time$
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Answer 1

Answer:

The change in  average speeds is 40 km/h

Step-by-step explanation:

Case 1 - The plane covers a distance of 800 km in 4 hrs

hence, the average speed is

800/4 = 200 km/h

Case 2 - The plane covers the same distance ( 800km ) in 5 hrs

hence, the average speed is

800/5 = 160 km/h

change in speed =  speed in case 1 - speed in case 2

= 200 - 160 = 40 km/h