Asked by Anonymous

Dorcas lives 4km from school. She walks 1km at 6km /h and travels the rest of the way by bus at 30om/h
How many minutes does the whole journey take?
What is her average speed in km/h
Answered by oobleck
time = distance/speed, so it takes 1/6 + 3/30 = 4/15 hr
avg speed is 4km / (8/30 hr) = 120/8 = 15 km/hr
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