Masha biked 20 km 20 minutes faster than Dasha biked 20 km. Find the speed of each cyclist if one biked 2 km/h faster than the other.

Aparallel system functions whenever at least one of its components works. consider a parallel system of n components, and suppose each component works independently with probability 0.5. find the conditional probability that component n works given that the system is working

Lisa has three classes that each last 50 minutes. what is the total number of minutes of the three classes

He that is measured at 220° is a reflex angle. the opposite angle is obtuse. find the measure of obtuse .