May you please help?​

Work out sian speed for the first 30 minutes of her journey. give your answer in km/h.

What is a carrier wave and how does it affect what you hear on the radio

Why is rain likely when warm, moisture-laden air meets cold air? a) the lighter warm air will rise and cool down, causing condensation and rain. b) the cold air moves faster and pushes the warm air away, causing condensation and rain. c) the moisture in the warm air condenses on contact with the cold air, causing rain to fall. d) the cold air mixes with the warm air, reducing its temperature causing moisture to condense.