Question

Two pipes can fill a cistern in 5 and 6 hours respectively. A third pipe can empty the cistern i
If all of the three pipes are opened simultaneously, how much time will they take to complet
cistern?
4
59/7 hours
3 30/7 hours​

Answer 1

the collection of eight planets and their moons in orbit round the sun, together with smaller bodies in the form of asteroids, meteoroids, and comets. The planets of the solar system are (in order of distance from the sun) Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.