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.
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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.
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
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