Mason and nora decided to swim across the river. mason began swimming 1 minute earlier than nora.

mason swam at a speed of 6 feet per second.
nora swam at a speed of 8 feet per second.
for how many seconds had mason been swimming at the moment when the two swimmers had swam exactly the same distance?

The figure shows triangle def and line segment bc, which is parallel to ef: triangle def has a point b on side de and point c on side df. the line bc is parallel to the line ef. part a: is triangle def similar to triangle dbc? explain using what you know about triangle similarity. part b: which line segment on triangle dbc corresponds to line segment ef? explain your answer. part c: which angle on triangle dbc corresponds to angle f? explain your answer. asap