Four people need to cross a rickety bridge at night. Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. The bridge is only strong enough to support two people at a time. Not all people take the same time to cross the bridge. Times for each person: 1 min, 2 mins, 7 mins and 10 mins. What is the shortest time needed for all four of them to cross the bridge?

What number do you get when you multiply all of the numbers on a telephone's number pad?

I have a clock(12-hour format) and both the needles of the clock overlap at 12:00.
After how much time, they will overlap again?

Find three whole, positive numbers that have the same answer when multiplied together as when added together.

Can you calculate the probability of getting a sum of six when a dice is thrown twice?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

What does below Rebus mean ?

esgg sgeg gegs gsge

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?