The speed of a boat in still water in 30 km/hr and the rate of current is 7 km/hr. The distance travelled downstream in 36 minutes is:  Answers:
A) 18.4 km	B) 20.6 km	C) 21.4 km	D) 1111 km	E) 22.2 km
22.2 kmxplanation:   Speed downstream = (30 + 7)= 
<gadget id="calculator">(30 + 7)</gadget>
<output>37</output>
37 kmph   Time= 36 minutes = 36/60 hour = 3/5 hour   Distance travelled = Time × speed = (3/5)×37 = 22.2 km   Answer: Option 22.2 km
<result>E</result>
The speed of a boat in still water in 30 km/hr and the rate of current is 7 km/hr. The distance travelled downstream in 36 minutes is: