Question

If it takes 4 hours at an average speed of 90 km/hr to complete a certain journey, how long would it take at 120 km/hr?​

Answer 1

Answer:

Distance of the entire journey =(48×10)km

Distance of the entire journey =(48×10)km =480km

Distance of the entire journey =(48×10)km =480kmIf the time taken = 8 hours, then increased speed =

Distance of the entire journey =(48×10)km =480kmIf the time taken = 8 hours, then increased speed = 8

Distance of the entire journey =(48×10)km =480kmIf the time taken = 8 hours, then increased speed = 8480

Distance of the entire journey =(48×10)km =480kmIf the time taken = 8 hours, then increased speed = 8480

Distance of the entire journey =(48×10)km =480kmIf the time taken = 8 hours, then increased speed = 8480 km/hr=60km/hr.

CONCLUSION:

∴ Increased in speed =60km/hr−48km/hr=12km/hr

Answer 2

Answer:

3 hours

Step-by-step explanation:

Basic formula that we required to solve this question is :-

Distance = Speed × time

or

Time = Distance ÷ speed

Total distance of journey

= Speed × time

= 90 × 4

= 360 km

Now, speed is given as 120 km/hr.

We know that distance is 360 km.

Time required to cover journey at 120 km/hr

= Distance ÷ speed

= 360 ÷ 120

= 3 hours