mary travel 60mph at 6am, tom travel 70mph at 8am. What time tom will catch up to mary

Answer 1

mary has a two hour head start

she is 120 mi (2 * 60) ahead when tom starts

tom catches up at 10 mph (70 - 60)

it takes tom 12 hr (120 / 10) to catch up

12 hr from 8 am is 8 pm

Answer 2

thank you ! how to write on this equation ?