PLEASE HELP ME 1) Darryl left the White House and traveled toward the ferry office at an average speed of 25 mph. Some time later Jacob left traveling in the opposite direction with an average speed of 35 mph. After Darryl had traveled for four hours they were 170 mi. apart. How long did Jacob travel?

2) A diesel train left the station at the same time as a freight train. The trains traveled in opposite directions. The freight train traveled at a speed of 34 mph. After 13 hours they were 793 mi. apart. How fast did the diesel train travel?
3) An aircraft carrier left the Dania Pier and traveled west at an average speed of 15 km/h. Some time later a fishing boat left traveling in the same direction but at an average speed of 20 km/h. After traveling for three hours the fishing boat caught up with the aircraft carrier. Find the number of hours the aircraft carrier traveled before the fishing boat caught up.
4) An Air Force plane left London and flew north at an average speed of 200 km/h. Some time later a cargo plane left flying in the same direction but at an average speed of 220 km/h. After flying for ten hours the cargo plane caught up with the Air Force plane. Find the number of hours the Air Force plane flew before the cargo plane caught up.
5) Abhasra left the White House and traveled toward the desert. Two hours later Julio left traveling at 35 km/h in an effort to catch up to Abhasra. After traveling for three hours Julio finally caught up. Find Abhasra's average speed.
6) Norachai left the mall and drove west at an average speed of 50 km/h. Chelsea left some time later driving in the opposite direction with an average speed of 20 km/h. After Norachai had driven for five hours they were 290 km apart. How long did Chelsea drive?
7) Huong made a trip to her cabin on the lake and back. The trip there took two hours and the trip back took three hours. She averaged 30 mph on the return trip. Find the average speed of the trip there. 20mph
8) Matt made a trip to his friend's house and back. On the trip there he drove 24 mph and on the return trip he went 30 mph. How long did the trip there take if the return trip took four hours? 5 hours
9) A passenger plane left Tokyo and flew south. Two hours later a jet left flying at 275 mph in an effort to catch up to the passenger plane. After flying for nine hours the jet finally caught up. Find the passenger plane's average speed.
10) A cattle train left Abuja and traveled east. Three hours later a diesel train left traveling at 50 km/h in an effort to catch up to the cattle train. After traveling for 12 hours the diesel train finally caught up. Find the cattle train's average speed.