I need help on this PLS HELP ILL GIVE YOU BRAINLIST

(a) average speed =

total distance = 1.7 km = 1700m

total time = 50 s

= 34 m/s

(b) total distance = area below graph

total distance = 1700 m

*the area below graph is a trapezium shape , so us the trapezium formula :

1/2 × ( total length of 2 parallel sides ) × height

1700 m = 1/2( 30 + 50 )(k)

1700 = 1/2 × 80k

1700 = 40k

1700/40 = k

k = 42.5

answer: procent 54 wynosi 33,33%