তিনটি পাইপ A, B এবং C একটি ট্যাঙ্ককে 30 মিনিট, 20 মিনিট এবং 10 মিনিটে খালি থেকে পূর্ণ করতে পারে...

Three pipes A, B and C can fill a tank in 30 min, 20 min and 10 min, respectively. When the tank is empty, all the three pipes are opened. If A, B and C discharge chemical solutions P, Q and R respectively, then the part of solutionRin the liquid in the tank after 3 min is

Three metal blocks A , B and C of masses 10 kg , 20 kg and 30 kg rest on a frictionless table in a line . A is converted to B and B to C by two pieces of string . With the help of a third string attached to C , the system is pulled to the right with a force of 60 N . Find the tensions of the first and second strings .

A Diwali cracker of mass 60 g at rest, explodes into three pieces A, B and C of mass 10 g, 20 g and 30 g respectively. After explosion velocities of A and B are 30 m/s along east and 20 m/s along north respectively. The instantaneous velocity of C will be

40 % of 4. 5+? % of2/3=20 % of 10 20 b. 25 c. 30 d. 35 e. none of these

The mean of 1^2, 2^2, 3^2, 4^2, 5^2, 6^2, 7^2 is (a) 10 (b) 20 (c) 30 (d) 40

In a group of 50 students ,30 like Basketball ,20 like football and 10 like neither of the games .How many like both the game ? The following steps are involved in solving the above problem .Arrange them in sequential order. (A) n(B cap F)=50-40=10 rArr 40 = 50 -n (B cap F) ( C ) Let n(B) = 30 ,n(F)=20 and n(B cup F)=50-10=40 We know that n(B cup F)=n(B)+n( F)-n(B cap F)