In a flat race, the runners up, running at / m/s lost by 3 secs to the winner. If the runners up took 15 secs to cover the distance, what was the speed of the winner?​

The human resources manager at a company records the length, in hours, of one shift at work, x. he creates the probability distribution below. what is the probability that a worker chosen at random works at least 8 hours? 0.62 0.78 0.84 0.96