Question

a car cover a certain distance in 10 hour at a speed of 48 km/h .by how much should its speed be increase so that it takes only 8 hours tovcivers the same distance​

Answer 1

Step-by-step explanation:

Answer:

a car finish a certain journey of 10 km in = 48 km/h.

1h =48 km/h

10 h = 48 * 10 = 480.

8 h = 480/8=60.

60-48=12 km/h.

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Answer 2

Answer:

$\bigstar{\bold{Increase\:in\:speed=12\:km/hr}}$

Step-by-step explanation:

$\Large{\underline{\underline{\bf{Given:}}}}$

• Time taken = 10 hr
• Speed = 48 km/hr
• Time taken in the second case = 8 hours

$\Large{\underline{\underline{\bf{To\:Find:}}}}$

• Increase in speed

$\Large{\underline{\underline{\bf{Solution:}}}}$

→ First we have to find the distance travelled by the car.

→ Distance travelled is given by

  Distance = Speed × Time

→ Substituting the datas we get,

  Distance = 48 × 10

  Distance = 480 km

→ Now we have to find the speed in the second case

→ Speed is given by the formula,

  Speed = Distance/Time

→ Substitute the values,

  Speed = 480/8

  Speed = 60 km/hr

→ Hence the speed of the car should be 60 km/hr for it to reach in 8 hours.

→ Increase in speed = 60km/hr - 48 km/hr = 12 km/hr

→ Hence the speed of the car should be increased by 12 km/hr

$\boxed{\bold{Increase\:in\:speed=12\:km/hr}}$

$\Large{\underline{\underline{\bf{Notes:}}}}$

→ Speed = Distance/Time

→ Distance = Speed × Time

→ Time = Distance/Speed