Question

Express the following speeds in km/hr 1:-12½​

Answer 1

Step-by-step explanation:

For this, we should remember the following conversion:

1 km = 1000 m

1 m = 11000 km

1 minute = 160 hour

1 minute = 60 seconds

1 second = 160 minute

Solved examples to express speed in different units:

1. The speed of a train is 45 km per hour. Calculate its speed in metres per second.

1 km = 1000 m

1 hour = 60 minutes; 1 minute = 60 seconds

1 hour = 60 × 60 seconds

Speed of the train = 45km1hour

= 45×1000m60×60sec

= 252 m/sec

= 1212 m/sec.

2. Convert the following speed as desired.

(i) 80 meter per minute into km per hour

Speed = distance/time

= 80meters1minute

= 801000km160hour

= 801000 × 601 km per hour

= 245 km per hour

= 445 km/hr

(ii) 20 m/second into km/hour

1 km = 1000 m

or, 1 m = 11000 km

20 m = 201000 km

1 hour = 60 × 60 = 3600 seconds

1 second = 13600 hour

But speed = distance ÷ time

= 201000 ÷ 13600

= 201000 × 3600 km/hour

= 72 km/hour

Answer 2

Answer:

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