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Transport in xylem (of water and minerals) is essentially unidirectional, from roots to the stems whereas the direction of movement in the phloem can be upwards or downwards, i.e., bi-directional, depending on the source and sink.
Two trains of same length are running in parallel tracks in the same direction with speed 90 km/hr and 120 km/hr respectively. The latter completely cro...
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...
A 280 m long train crosses a platform twice its length in 2 min. Find the speed of the train.
A train takes 22 seconds to cross a platform and 9 seconds to cross a pole. If the length of the train is 50 metres less than the length of the platform...
Ratio of the lengths of two trains ‘X’ and ‘Y’ is 6:7 respectively and the ratio of time taken by them to cross a pole is 4:5 respectively. If s...
1000 metres long train crosses a man who is moving in the same direction with a certain speed, in 25 seconds. If the same train can cross a tree in 20 s...
Two cars start from a place with a speed of 45 km/hr at an interval of 10 minutes. What is the speed of a man coming from the opposite direction towards...
Two trains C and D started from point A and B respectively. Speed of train D is 21 km/hr more than that of train C. Total distance between point A and B...
Two trains of same length are running in parallel tracks in the same direction with speed 40 km/hr and 70 km/hr respectively. The latter completely cros...
