The speed of the current is about 5 km per hour.
What is an equation?
An equation is an expression that shows the relationship between two or more numbers and variables.
Let x represent the speed of the current. The total time spent = 5h 24 min = 5 h + (24/60) = 5.4 hours
Hence when travelling with the current:
(a + 45)t₁ = 120
t₁ = 120 / (a + 45)
Also, when travelling against the current:
(45 - a)t₂ = 120
t₂ = 120 / (45 - a)
The total time is 5.4 hours
t₁ + t₂ = 5.4 hours
[120 / (a + 45)] + [120 / (45 - a)] = 5.4
a = 5 km/hour
The speed of the current is about 5 km per hour.
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