A) 15km/hr
B) 20km/hr
C) 24km/hr
D) 18km/hr
Correct Answer: D
Solution :
Let the speed of the boat in still water be x km/hr. The speed down stream \[9{{x}^{2}}+49{{y}^{2}}\] The speed up stream \[{{(a+b)}^{3}}-{{(a-b)}^{3}}=\_\_\_\_\_.\] \[{{b}^{3}}+3{{a}^{2}}b\] \[2({{b}^{3}}+3{{a}^{2}}b)\]You need to login to perform this action.
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