HELP ASAP. A school bus moves at speed of 35 mi/hr for 20 miles. How long will it take the bus to get to school?

Show work please.

Which element would mostly likely have an electron affinity measuring closest to zero

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.

What is the percent composition of ca(oh)2? 37.7% ca, 53.0% o, and 10.3% h 45.5% ca, 38.2% o, and 16.3% h 54.0% ca, 43.0% o, and 2.7% h 64.7% ca, 27.0% o, and 8.3% h