Answer Posted / ranganathappa c

we know that speed=distance travelled/time taken
let the total distance travelled 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.

=2x/[(x/60)+(x/40)]
=2x/[5x/120] (on simplification)
=48 kmph

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