points A and B are 90 km apart from each other on a highway A car starts from A and another from be at the same time if they go in the same Direction they meet in 9 hours and if they go in opposite direction they meet in 9 upon 4 hours find a speed
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suppose they have speed X and Y respectively
now, 90/(X+Y)=9. and 90/(X-Y)=9/4
now solve these two equations...
now, 90/(X+Y)=9. and 90/(X-Y)=9/4
now solve these two equations...
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