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=1/2 ×a×t×tp
30000=1/2×30×y×50
30000÷30=1/2×y×50
1000=1/2×y×50
1000÷25=y
40=y
3:4:5=30:40:50
Lp= Ls=1/2×a×t
=1/2×30×40
=600
Lsl=30×50=1500
=40×50=2000
=50×50=2500
1500+2000+2500+600=6600