A train travels 360 km at a uniform speed. If the speed is increased by 5 km/h, the journey takes 1 hour less. Find the original speed.
A number is divisible by 3 and 5. What is the smallest such number greater than 100?
What is the value of $\sin 30^\circ + \cos 60^\circ$?
What is the value of $2^{100} \mod 5$?