Question

3. A body travels
travels a distance of 10 km with a
constant speed of 30 kmh!) and then the
next 40 km at a constant speed of 50 km/h
find the average speed for the whole journey.​

Answer 1

$\huge\rm{Question}$

body travels

travels a distance of 10 km with a

constant speed of 30 kmh!) and then the

next 40 km at a constant speed of 50 km/h

find the average speed for the whole journey.

$\huge\rm{Solution}$

10 km at 30 kph takes 20 minutes

40 km at 50 kph takes 48 minutes

Therefore

50 km has taken 68 minutes

Average speed is 50/68 km per minute = 0.7353 km per minute

Or multiply by 60 minutes to get 44.12 kph