How many times in a given day, minutes and hour clock comes in a straight line ?

If you go to the movies and you're paying, is it cheaper to take one friend to the movies twice, or two friends to the movies at the same time?

What goes up but never comes down?

I know a nine-letter word having only one vowel.
Do you ?

What do you see in the given picture?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

Two boys wish to cross a river. The only way to get to the other side is by boat, but that boat can only take one boy at a time. The boat cannot return on its own, there are no ropes or similar tricks, yet both boys manage to cross using the boat.

How?

what does this picture(rebus) riddle means ?

_ _ _ IE _ _
_ _ _ IE _
_ _ IE _ _
_ _ IE _
_ _ _ _ IE

Like you see, some letters have gone missing from these words that contain the IE pair at some or the other place. The letters that will be used to fill the blanks are given below. Use them and form meaningful words. Can you do that?

A, C, D, F, H, K, L, M, N, N, O, R, R, S, S, S, T, T, Y and Y.