- 1 ∶ 3
- 1 ∶ 2
- 3 ∶ 1
- 2 ∶ 1
- 3 ∶ 2

Option 3 : 3 ∶ 1

**Given:**

The boat takes twice the time in upstream than downstream.

**Formula used:**

Distance = Speed × Time

Speed in upstream = (Speed in still water - speed of current)

Speed in downstream = (Speed in still water + speed of current)

**Calculation:**

Let the speed in still water be x km/h and the speed of current be y km/h

So, Speed in upstream = (x - y) km/h

Speed in downstream = (x + y) km/h

Let the time taken by boat in upstream and downstream be 2t and t respectively.

So, (x - y) × 2t = (x + y) × t

⇒ 2x - 2y = x + y

⇒ x = 3y

⇒ x/y = 3/1

⇒ x ∶ y = 3 ∶ 1

**∴ The ratio between the speed of the boat in still water and the speed of the current is 3 ∶ 1**

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