Question

On a 60 km straight road a bus travel the first 30 km with a uniform speed of 30 km per hour how far is the bus travel the next 30 km as to have average speed of 40 km per hour for the entire trip

Answer 1

TOTAL DISTANCE TO BE TRAVELLED = 60KM/S

AVG SPEED REQUIRED = 40 KM/H

THEREFORE TIME TAKEN WOULD BE = 3/2 HOURS (60/40)

TIME TAKEN FOR FIRST 30 KM/H = 30/30 =1 HOUR

SO TIME LEFT = 1/2 HOURS

DISTANCE TO BE COVERED = 30 KM/H

SO SPEED TO BE ATTAINED = 30/1/2=30*2/1= 60 KM/H

HOPE IT HELPS....