Iffor example you run the first kilometre in 6 minutes you have a pace per kilometre of 6 min/km, this corresponds to a speed of 10km/h. The first calculation is obviously much simpler and also quick to calculate without much effort. The pace for the 1000m world record is 2:12 min/km, while the world record for marathon running is a pace
Thespeed of a boat in still water is 15 km/hr. It goes 30 km upstream and return downstream to the original point in 4 hrs 30 minutes. Find the speed of the stream(in km/hr). View Solution. Q5. A man can row a boat at the rate of 4 km/hr in still water. Step1/2 First, we need to find the distance the girl walks to school. We know that she walks at a speed of 5 km/h for 15 minutes, so we can use the formula: distance = speed x time distance = 5 km/h x (15/60) h (since 15 minutes is 1/4 of an hour) distance = 1.25 km Now, we can use the formula again to find how long it would take her to cycle to Aboat which has a speed of `5 km` per hour in still water crosses a river of width 1 km along the shortest possible path in fifteen minutes. The velo asked Jun 25, 2019 in Physics by Anshu Priya ( 24.6k points)
Tomake a marathon in under 4 hours, you need an average pace of 5.69 min per km (5 minutes and 41 seconds). You will immediately obtain the average speed that you achieved – 13.33 km/h. That's pretty impressive! Now, take a look at the "time" field. We can rewrite our result as 4 min 15 sec per km.
5 Your goal is being able to run at a speed of slightly less than 10 km/h for 15 minutes, which isn't all that fast especially considering that it's just 15 minutes. You are currently able to run at a speed of about 8 km/h which is just fast walking speed. This suggests to me that you should work on your cardio fitness a lot more aggressively.
Speedof rowing in still water: 10 km/hr and the speed of the current: 5 km/hr. B. Speed of rowing in still water: 8 km/hr and the speed of the current: 7 km/hr. C. Speed of rowing in still water: 18 km/hr and the speed of the current: 12 km/hr. D.
Calculations Let the speed of the boat in still water be 6x and the speed of boat in the stream be x. Upstream speed = 6x - x = 5x. ⇒ Speed = Distance Time. ⇒ 5x = 5/ (15/60) ⇒ 5x = (5 × 60)/15. ⇒ 5x = 20. ⇒ x = 4 km/hr. So, the speed of the boat in still water is 24 km/h and the speed of the boat in the stream is 4 km/h.
Anintermediate runner is between 20-25 minutes, and an advanced runner from 15-20 minutes. In fact, the current world record for a 5km run is 12:46. Treadmill Speed: Average Calories : 15 minutes: 20km (12mph) 172: 20 minutes: a runner can expect to complete a 23km run in about two hours. This assumes a pace of roughly 5-6 minutes
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    • 5 km in 15 minutes speed