40. What is the slnpe (in {Emile and ftr'ft} between two points an a map, A and B, given that A has an elevation of 215D feet and B and elevation nf 450 feet ahnve sea level and they are 8 miles apart? 41. What is discharge {Q} of a stream if the current velocity (V) is 15 feet per seennd and the stream channel is lil feet wide CW] and 25 feet deep (D)? The discharge equatinn is Q = W x D x if so the answer shnuld be given in cubic feet per second th'fs}