Starting at home, ishaan traveled uphill to the grocery store for 12 minutes at just 15 mph. he then traveled back home along the same path downhill at a speed of 30mmph.
what is his average speed for the entire trip from home to the grocery store and back

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