Question

29. A car covers 30 km at uniform speed of 60
km/h and next 30 km at a uniform speed of 40
km/h. Find the total time taken.
(1 Point)
1 h 15 min
2 h 15 min
1 h 30 min
2 h 30 min​

Answer 1

Answer:

• The total time taken is 1 h 15 min.

Step-by-step explanation:

Given that:

• Car covers 30 km at uniform speed of 60 km/h.
• Next 30 km at a uniform speed of 40 km/h.

To Find:

• The total time taken.

We know that:

• Time = Distance/Speed
• 1 h = 60 min

In first case:

We have,

• Distance = 30 km
• Speed = 60 km/h

⟶ Time = 30/60

⟶ Time = 1/2 h

⟶ Time = 1/2 × 60 min

⟶ Time = 30 min

In second case:

We have,

• Distance = 30 km
• Speed = 40 km/h

⟶ Time = 30/40

⟶ Time = 3/4 h

⟶ Time = 3/4 × 60 min

⟶ Time = 45 min

Finding the total time taken:

⟶ Total time = (30 + 45) min

⟶ Total time = (30 + 30 + 15) min

⟶ Total time = (60 + 15) min

⟶ Total time = 1 h 15 min

Hence,

• The total time taken is 1 h 15 min.

Answer 2

Answer:

Given :-

29. A car covers 30 km at uniform speed of 60

km/h and next 30 km at a uniform speed of 40

km/h.

To Find :-

Total time taken

Solution :-

We know that

Time = Distance/Speed

In the first case

Distance is 30 km

Speed of 60 km/h

Time = 30/60

Time = 3/6

Time = 1/2 hr

In the second case

Distance is 30 km

Speed is 40 km/h

Time = 30/40

Time = 3/4

Now

Total time = 1/2 + 3/4

Total time = 2 + 3/4

Total time = 5/4 hrs

Now

1 hr = 60 min

5/4 hr = 5/4 × 60 = 5 × 51 = 75 min

75 min = 1 hr and 15 min