Question
A man rows 40 km upstream and 60 km downstream in 8
hours. If the ratio of his upstream speed to downstream speed is 2:3, then find the time required to travel 30 km upstream and 45 km downstream.Solution
ATQ,
Let the upstream and downstream speeds be 2x km/hr and 3x km/hr respectively. So, 40/2x + 60/3x = 8 = 20/x + 20/x = 8 = 40/x = 8 ⇒ x = 5 Required time = 30/2x + 45/3x = 30/10 + 45/15 = 3 + 3 = 6 hours
? * 4.89 = (410.15 ÷ 13.97) % of 6190 - 1342.77
What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exact value.)...
96.03% of √225.02 × 14.98 = ? + 19.98
What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exact value.)...
59.68% of √400 × 123.95 = ?
– (8.002)³ + (30.001)² - (4.01)⁴ =?
A, B & C have Rs.1550 together. If they divide the money in the ratio 1:3:1 respectively. Find the difference of amount received by B and C.
15.232 + 19.98% of 539.99 = ? × 8.99
56.05 2 – 24.24 2 + (63.98) 3/2 – 32.28% of 1500 = ? 2 + 113.03 × 5.09
24.99% of 1619.78 + (1259.84 ÷ 12.24) = ? × 16.98
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