Question

plete the journey in 5 hours?
14. A car covers a certain distance in 40 minutes, if it runs at 54 km/hr. How much time will
it take to cover the same distance at a speed 45 km/hr?​

Answer 1

Answer:

Time = 40mins= 2/3 hrs Speed =54km/hr

Distance=S×D

54×2/3= 36km

now speed is 45km/hr

so dist=45×2/3

30km

Answer 2

Answer:

Hello ✌️✌️✌️✌️✌️

Step-by-step explanation:

Speed of the car = 54 km/hr = 54*5/18 = 15 m/s

Time taken by the car to cover certain distance = 40 mins = 40*60 = 2400 s

Speed = Distance/Time

Distance = Speed * Time

Distance = 15*2400 = 36000 m = 36 km

Speed = 45 km/hr

Distance = 36 km

Speed = Distance/Time

Time = Distance/Speed

Time = 36/45 = 0.8 hrs

Concepts we used in this question,

i) Speed = Distance/Time

ii) km/hr to m/s = multiply 5/18

iii) m/s to km/hr = multiply 18/5