Question

The speed of sound in air is about 330 m/s. Express this speed
in km/h. How long will the sound take to travel 99 km ?

Answer 1

Answer:

5Minutes or 300 Seconds

Step-by-step explanation:

300*60*60 / 1000 = 1118 km/h

99KMs:

99/1118 = 1/12 hours

1/12*60 = 5 minutes

or 5*60 = 300 seconds

Answer 2

Hey there, here's your answer step by step:-

As we know,

1m = 10⁻³ km and

1s = 1 / 3600 hr

so 1m/1s = 10⁻³ ÷ 1 / 3600

             = 3600 / 10³

             = 18 / 5 km/hr

A/Q     v = 330m/s

So, in km/hr  v = 330× 18 / 5

                       = 66 × 18

                       = 1188 km/hr

Also, it is given that distance, s = 99km

As we know that

                          velocity = distance / time

                     i.e.           v = s / t

                          ⇒      t = s / v

                                      = 99 / 1188

                                      = 1 / 12 hr

                                      = (1 / 12) × 3600  

                                      = 300 seconds

Hope this helps you dear  

                        WISH YOU LUCK!!