Question

3. Some part of a journey of 555 km was completed by a car
with speed 60 km/h. Then the speed is increased by 15
km/h and the journey is completed. If it takes 8 hours to
reach, find the time taken and distance covered by 60
km/h speed.​

Answer 1

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Step-by-step explanation:

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Answer 2

Answer:

let the time take by the car be x hours for 60km/h and y hours for 15km/ h

therefore. distance covered by the car with speed of 60km/h =60x km

distance covered by the car with the speed of 15km/h =15x km

According to question

x+y=8....(1)

60x+15y=555....(2)

15(4x+y)=555

4x+y=555/15

4x+y=37....(3)

multiplying (1) by 4, we get

x+y= 8

4x+4y=32 ...(4)

subtracting (3) with (4)

37-32

x=5

therefore time taken by the car at the speed of 60km/h is 5 distance covered by the car is 60x5=300 km