Let 'F' be Frank's rowing speed,
and 'C' be the speed of the current.
Downstream:
F + C = 30 / 2 = 15 mph
Upstream:
F - C = 12 / 3 = 4 mph
Add the two equations:
2 F = 19 mph
Frank = 9.5 mph
Current = 15 - R = 5.5 mph
Check:
Subtract the two equations:
2 C = 11 mph
C = 5.5 mph yay !
2.2 Type your answer here...
Half an hour down stream one and a half hours upstream if the water is running at about 1 mile an hour.
The current speed is about 4 miles per hour.
Velocity = Distance ÷ Time.The speed upstream = 300 ÷ 5 = 60kph.The speed downstream = 300 ÷ 2 = 150 kph.The speed upstream equals boat velocity(Vb) minus current velocity(Vc).The speed downstream equals boat velocity (Vb) pluscurrent velocity (Vc).Vb - Vc = 60Vb + Vc = 150 : Adding the two equations together gives :-2Vb = 210 : Vb = 105, therefore Vc = 45The rate of the boat in still water is 105 kph. The rate of the current is 45 kph.
15 miles
Let speed of stream = y kmph & speed of boat = x kmphspeed downstram((x + y)kmph) = 8 * 60 / 40 kmph= 12 kmphspeed upstream((x - y) kmph) = 8/1 kmph= 8 kmphx + y = 12x - y = 8--------------2x = 20,2y = 4x = 10,y = 2=>Speed of stream = 2 kmph, Speed of boat = 10 kmp
To do this, you need to form equations using the information given. There are 2 variables here, the base speed of the rower with no current (x), and the speed of the current (y). Firstly, convert the distances and times given into average speeds. 20km/2 hours = 10km/h 4km/2 hours = 2km/h The actual speed = the base speed +- the current, depending on direction. So 10 = x + y 2 = x - y If we subtract these 2 equations to eliminate x, we get: 8 = 2y y = 4km/h
The duration of Fearless Frank is 1.38 hours.
The duration of My Mother Frank is 1.5 hours.
The duration of The Frank Show is 4 hours.
72 HOURS.
150