Question

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

Answer 1

Answer:

let distance covered at 60kmperh be x

td=555km

s1=60km/h

s2=75km/h

total time =8 hours

time taken for 60km/h=x/60

rest distance =555-x/75

atq

x/60+555-x/75=8 hours

5x -4x+2220/300=8

x+2220=2400

x=2400-2220

x=180km

Answer 2

The distance covered by 60 km/hr speed  is 180 km.

Step-by-step explanation:

Since we have given that

Distance covered = 555 km

Speed of car = 60 km /hr

if speed is increased by 15 km/hr, the new speed becomes

60+15 = 75  km/hr

So, First part of distance be x km

Second part of distance be 555-x

Total time taken by them = 8 hours

According to question, it becomes,

$\dfrac{x}{60}+\dfrac{555-x}{75}=8\\\\\dfrac{5x+4(555-x)}{300}=8\\\\5x+2220-4x=300\times 8\\\\x+2220=2400\\\\x=2400-2220\\\\x=180$

Hence, the distance covered by 60 km/hr speed  is 180 km.

# learn more:

Some part of of journey of 555km was completed by a car speed 60 km/hr .then the speed is increased by 15 km/hr as journey completed . If it takes 8 hours to reach thenfind time taken and and distance covered by 60km/hr speed

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