(1)a cyclist moving at a speed of 8 m/sec, cycles for 20 mins. how much distance does he cover. (2)mr jain walks for 21 min at a speed of 3 m/min. mrs mehta walks for 18 min at a speed of 3 m/min. who covers more distance and by how much?(3) a car travelling at a speed of 62 km/hr travels for 12 hrs, and a truck moving at 18 m/sec travels for 10 hrs. which coveres more distance ?(4) how long will a car travelling at a speed of 72 km/hr, take to cover 396 km? (5)
i walk at a rate of 2 m/sec. if i have to go to a shop, 265 m away, how long will i take ?
Answers
Answer:
Step-by-step explanation:
1. the cyclist moves 8 meters each second. 20 mins = 20 * 60 =1200 seconds.
so he covers a distance of : 1200 * 8 =9600 meters.
2. mr jain walks 3 meters each minute. he does this for 21 mins. so the distance covered in 21 * 3 = 63 meters.
mrs mehta walks 3 meters each minute and she does this for 18 mins. so the distance covered is 3 * 18 = 54 meters.
so mr jain has covered more distance(63 > 54). 63 - 54 = 9. So mr jain covers more distance by 9 meters.
3.the car is travelling at a speed of 62 km/hr which means that he covers a distance of 62 km each hour. if he keeps this up for 12 hours, then he covers a distance of 12 * 62 = 744 km
the truck is moving at a speed of 18 m/sec. each meter is 1/1000 of a kilometer. so the car is moving 18/1000 of a kilometer each second.
an hour is 60 mins and a minute is 60 seconds. so an hour has 60*60 = 3600 seconds.
so when the truck is moving 18/1000 of a kilometer each second. he moves 18/1000 * 3600 =(18*36)/10 kilometers an hour. so it's speed is (18*36) km/h
if it keeps moving at this speed for 10 hours, he will move (18*36)/10 * 10 =18*36 = 648 kilometers (648<744) so the car covers more distance.
Note: generally, to convert m/s to km/hr you multiply by 3.6 and to convert km/hr to m/s you divide by 3.6
in this case for example, the truck is moving at a speed of 18 m/s 18 * 3.6 = 18 * 36/10 = (18*36)/10. so the truck is moving at a speed of (18*36)/10 km/hr
4.the car travels at 72 km/h which means that he covers 72 km each hour. we want it to cover 396 km so we simply divide 396 by 72 which is 396/72 =5.5 hr. or 5 hours and 30 minutes.
5.you're walking 2 meters each second. and you want to cover a distance of 265. so you just divide 265 by 2 which is 256/2 = 128 seconds. or two minutes and 8 seconds