Verbal Reasoning - Mental Ability Questions

In a certain code language, '-' represents 'x', '÷' represents '+', '+' represents '÷' and 'x' represents '-'. Find out the answer to the following question.

18 ÷ 12 - 5 + 30 x 6 = ?

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.
DE, GI, KN, ?

In the following question, from the given alternative words, select the word which cannot be formed using the letters of the given word.
Nightwalker

Parul cycles 3 km East, then turns South and cycles 1 km, then turns West and cycles 2.5 km, then turns to her right and cycles 1 km. Where is she now with reference to her starting position?

Select the missing numbers from the given alternatives.

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.

Glacier, Waterfall, River, ?

Two cars C and D start from the same point. C travels 9 km South, then turns to its left and travels another 11 km. D travels 3 km East, then turns South and travels 5 km, then turns to its left and travels another 8 km. Where is D with respect to C now?

A and B start from the same point. A cycles 10 km South, then turns to her right and cycles 9 km. B cycles 2 km North, then turns West and cycles 15 km, then turns to her left and cycles 12 km. Where is B with respect to A now?