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. Let the speed of boat in still water =B and speed of stream =S Speed in Downstream =B+S Speed in Upstream =B-S ATQ- B+S=D/T … (1) B-S=D/2T … (2) Solve Equation (1) and (2) B=3D/4T, S=D/4T B/S=3/1 B:S=3:1 Alternate – Downstreamupstream T1:2 S2:1 Speed of B in still water(B)=(B+S)/2=3/2 Spped of stream(current)(S)=(B-S) =1/2 Ratio of B And S= 3:1
8(3/4) + 5(1/6) – 4(3/4) = ?
20 ×33 + 12 × 23 - 40 ÷ 15-1 + ? = 50
(750 / 15 × 15 + 152 + 20% of 125) = ?3
√ (12+√ (12+√ (12+ ⋯ ∞ ))
(60 × 8 ÷ 10) × 5 = ?
(√529 + 63 /8)% of 800 = ?% of 250
1 + 1 + 1/2+ 1/3 + 1/6 + 1/4 is equal to ____
68% of 450 – 1008 ÷ 14 + 516 ÷ 43 =?