Question

A car moves with a speed of 40 km/h for 15 minutes and then with a speed of 60 km/h for the next 15 minutes. The total distance covered by the car is ______.

विकल्प

• 100 km

• 25 km

• 15 km

• 10 km

Answer 1

A car moves with a speed of 40 km/h for 15 minutes and then with a speed of 60 km/h for the next 15 minutes. The total distance covered by the car is 25 km.

Explanation:

Case I

Speed ​​of car = 40 km/hr

Time taken = 15 min = `15/60`

= 0.25 hrs

Speed ​​= `" Distance travelled"/"Time taken"`

Distance travelled, d₁ = Speed ​​× Time taken

= 40 × 0.25

= 10 km

Case II

Speed ​​of car = 60 km/h

Time taken = 15 min = `15/60`

= 0.25 h

Speed ​​= `" Distance travelled"/"Time taken"`

Distance travelled, d₂ = speed × time taken

= 60 × 0.25

= 15 km

Total distance travelled by the car, d = d₁ + d₂

= 10 + 15

= 25 km

Hence, the total distance travelled by the car is 25 km.