Question
A cheetah can catch a deer running with a speed of 126
km/h and is 55 meters ahead of it, in 11 seconds. Find the time taken by the cheetah to catch a zebra that is 144 metres ahead of it and is running with a speed which is 80% of that of the deer.Solution
Speed of the deer = 126 km/h = 126 × (5/18) = 35 m/s Distance covered by the cheetah in 11 seconds = 55 metres + distance covered by the deer in 11 seconds = 55 + 35 × 11 = 55 + 385 = 440 metres So, speed of the cheetah = 440/11 = 40 m/s Speed of the zebra = 35 × (80/100) = 28 m/s So, relative speed of the cheetah with respect to the zebra = 40 – 28 = 12 m/s Hence, time taken by the cheetah to catch the zebra = 144/12 = 12 seconds
`11(2/13)` + `5(2/11)` - `3(4/9)` = ?
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.)...
? + 539.76 ÷ 5.4 × 94.80 = 9829.54
- 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.)
- 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.)
672.35 ÷ 24.03 × 12.99 – 1288.28 ÷ 13.94 = ?
(1680.23 ÷ 27.98) + (600.32 ÷ 23.9) + 1384.11 = ?
7.898 × ? + 139.89` ` `-:` 14.23 = 4004.04 – 353.89
` `
What is the area (in cm²) of a square inscribed in a circle with a radius of 10√2 cm?
What approximate value will replace the question mark (?) in the following?
29.99...
