Question

A river has a width of 23m. A row boat has a velocity of

4m/s on still water. The river flows with a velocity of 6m/s.
Calculate the time taken for the boat to cross the river.

Answer 1

t = 5.75 sec.

Step-by-step explanation:

X = V * t

23m = 4 m/s * t

t = 5.75 sec.

Answer 2

t = 5.75 sec.

Step-by-step explanation:

A river has a width of 23m. A row boat has a velocity of 4m/s on still water.

The river flows with a velocity of 6m/s.

find:

Calculate the time taken for the boat to cross the river.

a b

========================================

| /

| / Vr = 6m/s

| / 23m

| /

boat v = 4m/s

========================================

vertical motion:

X = V.t

where X is the width of the river = 23m

V is the speed of the boat with respect to river = 4m/s

t is the time trip it takes.

plug in values into the formula:

23m = 4 m/s * t

t = 5.75 sec.

therefore, the time it takes for the boat to cross the river is 5.75 seconds