Question

A rocket travels 18,000 km in 2 hours. What is its speed?​

Answer 1

Answer:

At a constant speed of 60 mph a vehicle travels 1 mile per minute. So 20 km at 60 mph will take 12 minutes and 48 seconds.

Answer 2

Step-by-step explanation:

1 km= 1000m

Or

1 m = 1/1000 km

1 hour = 60 minutes

Or

1 minute = 1/60 hrs

1 minute = 60 seconds

Or

1 second = 1/60 minutes

For Example:

1. The speed of train is 60 km/hr; find its speed in metres per second.

Solution:

According to the problem, we know the speed of the train is 60 km/hr.

Distance covered in metres;

1 km = 1000 m

Therefore, 60 km = 60 × 1000 m

60 km = 60000 m

Time taken in seconds;

1 hr = 60 minutes;

1 minutes = 60 seconds

Therefore, 1 hr = 60 × 60 sec

1 hr = 3600 sec

Speed = (Distance )/(Time )

= 60000/3600 metres per second

To find Speed when Distance and Time are given

= 16 2/3 metres per second

2. A car travels at a speed of 25 metres per second. Find its speed in km per hour.

Solution:

Distance travelled in 1 sec = 25 metres

Distance travelled in 1 hr = 25 × 3600

1 metre = 1/1000 km

= (25 × 3600)/1000 km

= 90000/1000 km

= 90 km