Advertisements
Advertisements
प्रश्न
These log boats do not go very far. If the wind is helpful, then travel about 4 km in one hour.
How long will they take to go a distance of 10 km?
Advertisements
उत्तर
In 1 hour the boat travels 4 km
Hence, in 2 hours the boat will travel 2 × 4 = 8 km
And in `1/2` hour the boat will travel `4/2` = 2 km
So, in 2 and a half-hour, the boat will travel 8 + 2 = 10 km.
APPEARS IN
संबंधित प्रश्न
A and B take 6 hours and 9 hours respectively to complete a work. A works for 1 hour and then B works for two hours.
(i) How much work is done in these 3 hours?
(ii) How much work is still left?
Two taps can fill a cistern in 10 hours and 8 hours respectively. A third tap can empty it in 15 hours. How long will it take to fill the empty cistern, if all of them are opened together?
A motorist travelled the distance between two towns, which is 65 km, in 2 hours and 10 minutes. Find his speed in metre per minute.
A boy drives his scooter with a uniform speed of 45 km/h. Find the time taken by him to cover 108 km.
The speed of sound in air is about 330 ms-1. Express this speed in kmh-1. How long will the sound take to travel 99 km?
Mr. Amit can walk 8 km in 1 hour 20 minutes. How long will it take him to walk:
(i) 2500 m?
(ii) 6.5 km?
Wilson reached 240 Km at the speed of 60 Km/hour. How much time did he travelled?
Nazar travelled 360 Km at the speed of 90 Km/hour. Find the time taken for his travel
From where you are, what interesting things do you see to your east?
A runner covers 900 m in 3 min. Speed in m s⁻¹ is:
