Question

d) moving with
The total distance covered by the car is
17. A car moves with a speed of 60 km h- for 20 min
and then at a speed of 30 km h- for the next 20 min​

Answer 1

Correct Question

A car moves with a speed of 60 km h- for 20 min and then at a speed of 30 km h- for the next 20 min. Then find the total distance covered by the car.

Solution-

Given that, the speed of car in first 20 minutes is 60 km/hr.

As per given question, there are two cases in it. In first case car is moving with a speed of 60 km/he for 20 min and then with a speed of 30 km/hr for next 20 min.

Distance = Speed × Time

Firstly, convert time into hours. To convert minutes into hours, divide the given value by 60.

Time = 20/60 = 0.33 hours

Now, substitute the values,

Distance (d1) = 60 × 20/60 = 20 km

Similarly, car moves with a speed of 30 km/hr for the next 20 min.

Here, speed = 30 km/hr and time = 20 min = 20/60 hours

Distance (d2) = 30 × 20/60 = 20/2 = 10 km

Total distance covered by the car = Distance covered by the car in 20 min + Distance covered by the car in next 20 min

= (d1 + d2) km

= (20 + 10) km

= 30 km

Therefore, the total distance covered by the car is 30 km.

Answer 2

CORRECT QUESTION:

A car is moving with a speed of 60kmh-¹ for 20min and then at a speed of 30kmh-¹ for next 20 min. Find the total distance covered by the car

GIVEN

• Speed in first 20min = 60km/h
• Speed in second 20min = 30km/h

Converting 20min → hours

→ 20/60 = 0.33 hrs

Let

• Distance travelled in first 20min : d₁
• Distance travelled in second 20min : d₂

Finding distance travelled in first 20min by:-

Distance = speed × time

d₁ = 60 × 0.33

d₁ ≈ 20

Similarly

Finding distance travelled in second 20min:

d₂ = 30 × 0.33

d₂ ≈ 10km

Total distance: d₁ + d₂

Total distance = 20km + 10km

Total distance = 30km

Hence, total distance = 30km