Time & Work Calculation and TNPSC Group II Main Model Question
A can complete a journey in 20 hours. He travels first half of the journey at the rate of 42 km/hr and second half at the rate
of 48 km/hr. Find the total journey in km.
An aeroplane flies along the four sides of a square at the speeds of 400, 600, 800 and 1000 km/h. Find the average speed
of the plane around the field. (more…)