|A) 48 kmph||B) 50 kmph|
|C) 46 kmph||D) 42 kmph|
we know that speed = distance traveled/time taken
let the total distance traveled by the car is 2x km.
then time taken by it to cover first half is x/60 hour.
and for second half is x/40 hour.
Then average speed= total distance travelled / total time taken.
= 48 kmph.