Verbal Reasoning - Mental Ability Questions

In the following question, which one set of letters when sequentially placed at the gaps in the given letter series shall complete it?

ab_ _abbc_aa_bbb

In a certain code language, '+' represents 'x', '-' represents '+', 'x' represents '÷' and '÷' represents '-'. What is the answer to the following question?
72 x 9 - 14 + 2 = ?

In the following question, which one set of letters when sequentially placed at the gaps in the given letter series shall complete it?

K_L_K_LN_M_N

Find the missing number in the given figure?

Which set of letters when sequentially placed at the gaps in the given letter series shall complete it?

j_l_jk_m_kl_

If 879= 8, 625= 1, 586= 9, then 785 = ?

From the given words, select the word which cannot be formed using the letters of the given word. CIRCUMSTANCES

A and B are standing at place "P". They start moving in the opposite directions at the speed of 5 Kmph and 4 Kmph respectively. What will be the distance between them after 3 hours?