Two points a and b are 100mm apart. A point c is 75 mm from a and 45mm from b. Draw an ellipse passing through point a, b, c so that ab is a major axis
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Relative speed of trains = (68 – 50) km/hr
= 18 km/hr
= 18 × 5/18 m/sec
= 5 m/sec
Time taken by the train to clear off each other = sum of length of trains/relative speed of trains
= (130 + 140)/5 sec
= 270/5 sec
= 54 sec
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