Ravi starts for his school from his house on his cycle at 8 : 20 a.m. If he runs his cycle at a speed of 10 km/h, he reaches his school 8 minutes late, and if he drives the cycle at a speed of 16 km/h, he reaches his school 10 minutes early. The school starts at:

Options

A. `8:40 a.m`
B. `9:40 a.m`
C. `8:50 a.m`
D. `9:00 a.m`

Answer

D