A car moves for half of its time at 80 km/h and for rest half of time at 40 km/h. Total distance covered is 60 km. What is the average speed of the car?
a.60 km/h
b.80 km/h
c.120 km/h
d.180 km/h
Richard ebright is a scientist and the main credit for why he is a scientist goes to his mother. His mother was her only friend till he started school her mother used to find things for him to do not physical work but stuff to learn. She used to take him on trips and bought him microscope, telescope, camera and mounting material. they used to spend time together at night. After he finished collecting 25 species of butterflies near his home his mother gave him a book called 'The Travel of Monarch X' which told about how monarch butterfly migrate to central america.
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