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Train A runs at the speed of 80 km/h and it leaves from station X at 6:00 o'clock. Train B departs from the same station at 6:15 o'clock. At what speed should train B run so as to reach together with Train A on the next station located at a distance of 100 km?1. 100 km/h2. 90 km/h3. 95 km/h4. 110 km/h |
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Answer» Correct Answer - Option 1 : 100 km/h Speed of train A = 80 km/h Time is taken by train A = t hr Time is taken by train B = (t - 15/60) hr Distance = 100 km Let Speed of Train B = Skm/h According to ques; Distance covered by train A = Speed× time 100 = 80× t t = 5/4 hr Similarly Distance covered by train B = Speed× time 100 = S× (t - 15/60) put t = 5/4 hr 100 = S× (5/4 - 15/60) 100 = S× 1 S = 100 km/h Hence, Speed of train B is 100 km/h. |
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