Math
posted by Da S .
Fauzia took 30min to cycle from her house to the cinema. If she cycled the first 3km of the journey at a speed of 150m/min, find her average speed for the remaining 3km of the journey

first part  3 km = 3000 m
time for 1st part = 3000/(150) = 20 minutes
second part  3 km
time for second part = 3020 = 10 minutes
speed for 2nd part = 3000/10 = 300 m/min
Her speed for the second leg of the trip was 300 m/min 
1km = 1000m
She covered the first 3000 meters in 3000/150 = 20 minutes.
Since she covered the remaining 3000 meters in 3020=10 minutes, she must have cycled at 300m/min on average through this stage.
Average speed is distance divided by time.