Which of the given two statements A and B is/are true? What is the force of gravity:
A. It is directly proportional to the product of the masses of the two objects.
B. It is directly proportional to the square of the distance between two
objects.
Out of total 85 students, 35 took Mathematics, 33 took Biology, while 23 students did not choose these two subjects. How many students opted for both Mathematics and Biology subjects?
A mini van passes two persons moving in the same direction at 5.4 km/h and 6 km/h such that the mini-van is moving at 4.5 sec and 6.75 sec respectively. What is the length of the mini-van?