Question
Speed of a boat in still water is 10 kmph and speed of
stream is 7 kmph. A man rows to a place at a distance of 51 km and come back to starting point. The total time taken by him is:Solution
Rate upstream = 10 – 7 = 3 kmph Rate downstream = 10 + 7 = 17 kmph Time taken to go upstream = 51/3 = 17 hr Time taken to go downstream = 51/17 = 3 hr Total time = 17 + 3 = 20 hrs
- What will be come in place of (?) in the given expressions.
725 – [32 × 5 + {144 ÷ 12}] = ? What will come in the place of question mark (?) in the given expression?
(18 × 8 ÷ 12) × 10 = ?
If (3 × 144 – 252 ÷ 14) ÷ 18 = √1024 – x, then find the value of ‘x’.
29% of 400 + 66% of 1100 - 50% of 1200 = ?
25% of 440 + 88 X (1/2)2 - 28 = 8 X ?
What will come in the place of question mark (?) in the given expression?
(3.2 × 35 + ?) ÷ √16 = 38.5
7(1/5) – 3(1/4) + 8(3/4) = ?
- What will come in the place of question mark (?) in the given expression?
1231 + 1312 + 2113 – 3211 = ? What will come in the place of question mark (?) in the given expression?
25% of 1280 + (41 × 4) = ?2
(30 × 0.80)⁴ ÷ (2160 ÷ 60)⁴ × (54 × 16)⁴ = (6 × 4)?+5