A motorboat embarks on a trip, heading downstream in a river in which the current flows at a rate of 1.5 m/s. After 30.0 minutes, the boat has traveled a distance of 24.3 km downstream. How long will it take the boat to travel upstream to its original point of embarkation?

How does the formation of intrusive and extrusive igneous rocks differ?

Derive the formula 2as=v² -u² where the formula have have usual meanings

It's time for santa to deliver his presents. assuming he delivers presents all over the world, he has to travel about 75,000,000 miles. if he travels east to west, he can use the time zones to make christmas day last 31 hours. what speed, in miles per hour, must santa fly to get all of his presents delivered?