Question

a boat goes 720 mi downstream in the same time it can go 630 miles upstream. The speed is 7 mi per hour. find the speed of the boat in still water.

Answer 1

????????????????????? "the speed" ?????????????

WOT speed?????

maebee yu tri tu sae water in streem muev at 7 MPH?????

me thank yu tri tu sae boet go at a fixed speed relativ tu water

& then in SAME TIME go 720 with the water or 630 miles GINST water

then 1...(boet speed +water speed)*time=720

2... (boet speed -water speed)*time=630

1+2...2*(boet speed)=(720+630)=1350, so boet speed*time=1350/2=675 miles

1-2...2*(water speed)*time=720 -630=90, so water-speed*time=90/2=45

if yu tried tu sae water speed=7 mph, then time=45/7mph =6.4285714285714... ours

boet speed=675 mile/6.428571428...=105 mph

no boet kan go that fast