the speed at which a man can row a boat in still water is 21 kmph. if he rows downstream, where the speed of current is 5 kmph, what time will he take to cover 90 metres?
Choose the correct answer:
A) 23.46 B) 27.46 C) 28.46 D) 12.46 E) 25.46
<gadget id="calculator">21 + 5</gadget>
<output>26</output>

<gadget id="calculator">10 / 36</gadget>
<output>5/18 = around 0.277778</output>

<gadget id="calculator">26 * (5/18)</gadget>
<output>65/9 = around 7.222222</output>

<gadget id="calculator">90 / (65/9)</gadget>
<output>162/13 = around 12.461538</output>

<result>D</result>
the speed at which a man can row a boat in still water is 21 kmph. if he rows downstream, where the speed of current is 5 kmph, what time will he take to cover 90 metres?
divide(90, multiply(add(21, 5), const_0_2778))
speed of the boat downstream = 21 + 5 = 26 kmph = 26 * 5 / 18 = 7.22 m / s hence time taken to cover 90 m = 90 / 7.22 = 12.46 seconds . answer : d