Question
A person covers a certain distance by car, driving at
the speed of 90 kmph and returns back to the starting point, riding on a bike at the speed of 60 kmph. What is his average speed for the whole journey?Solution
Average speed = 2xy/(x+y) = (2 × 60 × 90)/(90+60) = 72 km / hr.
If another new department ‘R&D’ was formed and 40% of the employees from IT and Marketing departments each were moved to the new department, then fi...
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11, 13, 30, 96, 392, ?
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