A bus travels a distance 120 km with a speed of 40 km/h and returns with speed of 30 km/h.(calculate the average speed for the entire journey
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Answer:
Hi mate
Here's your answer
Explanation:
When the bus is going to the journey,
Distance =120km
Speed =40 km/h
time= x
speed =distance / time
40=120/x
By cross multiplication .
40x = 120
x=120/40
x=3
So the time is 3hours
when the bus is returning from the trip
Distance = 120 km
speed= 30 km/h
time= x
speed= distance /time
30=120/x
By using cross multiplication
30x=120
x= 120/30
x=4hours
So the time is 4 hours
Avg speed for the whole journey
avg speed = total distance /total time
avg speed = 120/3+4
avg speed = 120/7
avg speed = 17.142 km/h
17.142 is the avg speed
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