Relative speed = 30 + 20 = 50 km/hrs Time taken to meet for the first time = length of the track/ relative speed => 500 / (30 + 20) => (500 x 18)/(50 x 5) = 36 sec
Simplify:
72 – 4(40 + 24 ÷ 8 × 6 – 4 × 4) + 20
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