Question

PLZ NEED HELP NOW TAKING TEST 40 POINTS

Two trains are traveling between city A and city B a distance of 4000 kilometers (km). The regular train travels at a speed of 80 kilometers per hour (km/h). The express train leaves at the same time on a parallel track and travels at 100 km/h. The formula for speed (S) is S=D/T where S is speed, D is distance and T is time. How much earlier will the express train arrive at city B?


10 HOURS

40 HOURS

50 HOURS

90 HOURS

Answer 1

40 hours

Explanation:

first i want to know the answer i think it is 40 hours or 10 hours or 50 or maybe 90 hours