A boat covers 143 km upstream in 13 hours and the same distance downstream in 11 hours. What is the speed (in km/hr) of the boat in still water?
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The cash difference between the selling price of an article at a profit of 2% and 18% is Rs. 3. The ratio of two selling prices is
As a sailor jumps in the forward direction, the boat moves backwards. This example illustrates Newton's :
The mean of 10 observations is 17. One more observation is included and the new mean becomes 16. The 11th observation is
A train runs at 80 kmph for the first 40 km and the next 30 km at 60 kmph. Find the average speed.
The value of tan80° tan10° + sin270° + sin20∘
Cod liver oil from fish is rich in which vitamin?
The value of the expression 2(sin6θ+cos6θ) - 3(sin4θ+cos4θ) + 1 is
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