Verbal Reasoning - Mental Ability Questions

What should come in place of the question mark (?) in the following number series? 1, 3, 24, 360,8640, 302400, ?

Pointing towards a girl, Rajan said, she is the daughter of my mother's daughter. Then how is the girl related to Rajan?

Select the related word/letters/number from the given alternatives.
JS : QH : : VW : ?

In the following question, select the related number from the given alternatives.
243 : 578 : : 163 : ?

If 70*10 = -7, 50*5 = -10 and 10*5 = -2, then find the value of 80*1 = ?

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.
MN, PQ, TU, YZ, ?

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

D, G, K, N, R, ?, ?, B, F

Riya travels 5 km in the east direction, takes a right turn and travels another 8 km. Next, she turns left to travel 4 km and then takes another left turn to travel 8 km more. Finally, she turns towards the east and travels 5 km. How far is she now from her original position?