A cistern can be filled by a tap in 4 hours while it can be emptied by another tap in 9 hours.If both taps are opened simultaneously, then after how much time will the cistern get filled ?

/`` Dec 22, 2017 17:42

/`` Dec 22, 2017 17:42

A goods carriage of length 2 km, headed to Srinagar from Punjab was running at a speed of 30 Km/hr. it crosses a tunnel which is 58 km long with that speed. Find the time taken by the goods carriage to cross the tunnel.

/`` Dec 20, 2017 10:06

/`` Dec 20, 2017 10:06

A tank is 25 m long, 12 m wide and 6 m deep. The cost of plastering its walls and bottom at 75 paise per sq. m, is:

/`` Nov 01, 2017 08:46

/`` Nov 01, 2017 08:46