Calculating duration of time in hours and minutes

Maths

Mary started the race at ten past three. She finished one hour and twenty minutes later. What time did she finish the race?

Alex started the race at ten past three. She finished one hour and twenty five minutes later. What time did she finish the race?

Charlie started the race at ten past three. He finished one hour and ten minutes later. What time did he finish the race?

Jane started the race at twenty past two. She finished 20 minutes later. What time did she finish the race?

Sam started the race at quarter to five. He finished 35 minutes later. What time did he finish the race?

Sam started the race at twenty past two. He finished 20 minutes later. What time did he finish the race?