Manoj and his wife Swathi fill a tank with water fetched from a well. Manoj fetches 5 litres of water in 4 minutes whereas Swathi fetches 4 litres of water in 5 minutes. Find the time taken by them together to fetch 205 litres of water.
Answer & explanation
Correct answer: option 3
Every 4 min = 5 L water is added and Every 5 min = 4 L water is added,
4 min = 5 L and 5 min = 4 L
8 min = 5 L 10 min = 4 L
12 min = 5 L 15 min = 4 L
16 min = 5 L 20 min = 4 L
20 min = 5 L 20 min = 16 L
20 min = 25 L
Therefore, in every 20 minutes, (25 + 16) = 41 L of water is added,
Hence in 100 minutes , 205 litres of water is added.