10. California is 10 hours ahead of South Africa. If the time in South Africa is \( 10: 30 \), what will the time be in California. 11. A student took 33 minutes to walk from home to college. If he left home at \( 6: 38 \), at what time did he reach college?

**10. Calculation for California's Time** Since California is \(10\) hours ahead of South Africa, we add \(10\) hours to the South African time. - Given South Africa time: \(10:30\) - Add \(10\) hours: \[ 10:30 + 10\,\text{hours} = 20:30 \] Thus, the time in California is \(20:30\) (or \(8:30\) p.m.). --- **11. Calculation for the Student's Arrival Time** The student left home at \(6:38\) and it took \(33\) minutes to walk to college. - Start time: \(6:38\) - Add \(33\) minutes: \[ 6:38 + 33\,\text{minutes} = 7:11 \] Thus, the student reached college at \(7:11\).