Correct Answer - Option 2 : 120 km/h

**Given:**

The ratio between the speed of the bus, train and bike = 3 : 9 : 8

Distance covered by the bike = 960 km

Time taken by bike = 12 hours

**Formula Used:**

Speed = (Distance)/(Time)

**Calculation:**

Speed of the bike = (Distance)/(Time)

⇒ 960/12

⇒ 80 km/h

Let the speed of the bus, train and bike be 3x, 9x and 8x respectively.

Now, 8x = 80

⇒ x = 10

Speed of the bus = 3x

⇒ 30 km/h

Speed of the train = 9x

⇒ 90 km/h

Hence, Sum of the speed of the bus and train together = (30 + 90) km/h

⇒ 120 km/h

**∴ The sum of the speed of the bus and train together will be 120 km/h.**