sudha cycles to her school at an average speed of 12km/hr.it takes her 20min to reach the school. if she want sto reach her school in 15 min , what should be her average speed.
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Answer:
16 km/hr
Step-by-step explanation:
Given,
sudha cycles to her school at an average speed of 12km/hr.it takes her 20min to reach the school.
average speed=total distance travelled /total time taken
12km/hr=Distance/20 mins
distance=12km/hr*20 mins
if she wants to reach her school in 15 min , what should be her average speed.
let x be average speed
x km/hr=distance/15 mins
Distance=xkm/hr*15mins
if distance is same,then,
12 km/hr*20/60=x km/hr*15/60
x km/hr=16 km/hr
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