Rahmat walks and cycles at uniform speed. When he walks for 2 hours and cycles for 1 hour, the distance travelled is 24 km. When he walks for 1 hour and cycles for 2 hours, the distance travelled is 39 km. Find the speed at which he cycles.

You were told that the amount of time lapsed between consecutive trades on the new york stock exchange followed a normal distribution with a mean of 15 seconds. you were also told that the probability that the time lapsed between two consecutive trades to fall between 16 to 17 seconds was 13%. the probability that the time lapsed between two consecutive trades would fall below 13 seconds was 7%. what is the probability that the time lapsed between two consecutive trades will be between 14 and 15 seconds?