A group of friends decide to attend a night on a cruise ship. Will last 4 hours. Ship travels upstream 18km and back to starting point. Current is 2km an hour. What is the ships speed and how long was the journey upstream?

Arefrigeration system at your company uses temperature sensors fixed to read celsius (°c) values, but the system operators in your control room understand only the fahrenheit scale. you have been asked to make a fahrenheit (°f) label for the high temperature alarm, which is set to ring whenever the system temperature rises above –10°c. what fahrenheit value should you write on the label?