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.