Time to Finish a Job | Class 7 Maths Ch 8 | NCERT Ganita Prakash

In this lesson: • Ravi paints a wall in 3 hours, Meena in 6: how long together? • Why adding or averaging the times cannot be right • Work done in one hour: one third + one sixth = half the wall • Together they take 2 hours • Rate is the time flipped: rates add, times do not • Taps filling a tank in 4 and 12 hours: 3 hours together • Check: together must beat the fastest worker alone NCERT Ganita Prakash, Class 7 — Chapter 8: Working with Fractions