- 720 km/hr
- 240 km/hr
- 480 km/hr
- 1540 km/hr

Option 2 : 240 km/hr

**Given: **

An airplane covers a certain distance at a speed of 80 km/hr in 5 hours

**Formula Used:**

Distance = Speed × Time

**Calculation:**

Distance is constant

So, S1/S2 = T2/T1

⇒ 80/S2 = (5/3)/5

⇒ S2 = 240 km/hr

∴ To cover the same distance in 1 and 2/3 hours airplane must travel at a speed of 240 km/hr.

The correct option is 2 i.e.240 km/hr

__Alternate Method__

Distance = speed × Time

⇒ Distance = 80 × 5

⇒ Distance = 400 km

⇒ Airplane covers 400 km

According to question

Distance = 400 km

Time = 1 and 2/3 hours = 5/3 hours

Speed = Distance/ Time

⇒ Speed = 400/(5/3)

⇒ Speed = (400 × 3)/5

⇒ Speed = 240 km/hr

∴ To cover the same distance in 1 and 2/3 hours airplane must travel at a speed of 240 km/hr.

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