Question

pls answer this physics question

Answer 1

33 km/h

hope it helps

Answer 2

as it takes her 30min from home to school in distance 12km

from school to library 15min in 6km

from library to home 15min in 15km

so, speed = distance/time

convert all to hours from minutes

30min =1/2 , 15min=1/4

speed = 12km+6km+15km/1/2+1/4+1/4 (L.C.M OF DENOMINATORS)

=   12+6+15/2/4+1/4+1/4    = 12+6+15/4/4

=   12+6+15/1

=   33km/h  (option C )