Question

Find the speed of the boat if it takes 3 hours to travel a distance of 90km upstream and the speed of the stream is 4km/hr?

• A. 30 kmph
• B. 34 kmph
• C. 38 kmph
• D. 42 kmph

Answer 1

Answer:

B. 34 kmph

$$Let the Speed of Boat be X kmph </p><p style="color: rgb(0,0,0); margin-top: 2px; margin-bottom: 2px" data-pxy="true">$$Speed of boat upstream = X -4

Time taken to cover Upstream distance $=\frac{90}{X-4}=3hrs$

$3\times{(X-4)}=90$

$3X-12=90$

$3X=102$

$X=34$

Speed of Boat $= 34kmph$