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Total age of 18 girls = 18 × 36 = 648 years If the age of two more girls is added the average decreases by half a year, ∴ Total age of 20 girls = 35.5 × 20 = 710 Now, sum of the age of new girls = 710 – 648 = 62 years
Two trains A and B, were proceeding in the same direction on parallel tracks at 25 km/hr and 79 km/hr respectively. A man noticed that it took exactly 1...
Two trains approach each other at 23 kmph and 26 kmph from 2 places 245 km apart. After how many hours they will meet?
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Ratio of the lengths of two trains ‘X’ and ‘Y’ is 3:4 respectively and the ratio of time taken by them to cross a pole is 2:3 respectively. If s...
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A train takes 18 seconds to cross a 120-metre-long platform. If the speed of the train is 36 km/h, then find the time taken by the train to cross a 240-...
A train travels 240 km at a uniform speed. If the speed of the train is increased by 20 km/h, it takes 1 hour less to cover the same distance. What is t...
Two trains of same length are running in parallel tracks in the same direction with speed 60 km/hr and 90 km/hr respectively. The latter completely cros...
A train can cross a pole in 24 seconds. While if the train increased its speed by 50% then time taken by it to cross 234 metres long platform is 42 seco...
