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semoga bener
diketahui waktu = 15 menit = 60(15) = 900 detik
jarak ditempuh = 1800 meter
sehingga kecepatan = jarak bagi waktu
kecepatan = 1800 / 900 = 2 m/detik
WOW KITA PUNYA JAGOAN MARATON YANG LAIN, SAMBUTLAH.... PAK TOMO!!!!!!