Question
An investment of ₹10 lakh yields ₹4L, ₹3L, ₹2L,
₹1L over four years. What is the payback period?Solution
Cumulative inflows: 
A boat travels 48 km downstream in 4 hours and 24 km upstream in 6 hours. What is the speed of the boat in still water?
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A boat goes 30 km downstream in 3 hour and the same distance upstream in 5 hours. The speed of the boat in still water is:
