- 270 km/h
- 290 km/h
- 250 km/h
- 220 km/h
- None of the above

Option 1 : 270 km/h

**Given:**

Speed to cover 60 km = 30 km/h

Speed to cover 120 km = 40 km/h

Average speed = 75 km/h

**Formula used:**

S = D/T

S = Speed, D = Distance, T = Time

**Calculation:**

Time taken to travel in first phase = 60/30

⇒ Time taken to travel in first phase = 2 hours

Time taken to travel in second phase = 120/40

⇒ Time taken to travel in second phase = 3 hours

⇒ Total time taken of travel = 450/75

⇒ Total time taken = 6 hours

⇒ Hours left = 6 – 5 = 1

⇒ Distance left = 450 – (120 + 60)

⇒ 450 – 180 = 270

⇒ Train needs to cover 270 km in 1 hour

**∴ speed of train in last phase is 270 km/h**

__Hint__

**Find total time taken and subtract it from time consumed in order to obtain speed of remaining phase**

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