A man complete a journey in 10 hours. He travels first half of the journey at the rate of 21 km/hr and second half at the rate of 24 km/hr. Find the total journey in km.
Let's total time=t=10 hrs= 600 min............(i) total distance travelled=x half distance=d1=d2=x/2........................................(ii) Speed=s1=21 km/hr= 0.35 km/min..............................(iii) s2= 24 km/hr= 0.4 km/min.................................(iv) t=d/s=[(d1/s1)]+[(d2/s2)] 600 = [( x/2) / 0.35] + [( x/2) / 0.4] 600 = x/2* [ 2.857 + 2.5 ] x = 600*2 / 5.357 x = 224 km
t=d/s=[d1/s1]+[d2/s2] 10*60=[(x/2)/(21/60)]+[(x/2)/(24/60)]..............convert hrs in min x=1600km ans is total journey 1600km
let x is total distance (1/2)*x/21 + (1/2)*x/24 = 10 x/21+ x/24 = 20 15x = 168*20 x =(168*20)/15= 224 km.
A man travels 840 km in 12 hours, partly by train and partly by car. If he had travelled all the way by train, he would have saved 1/4 of the time he would have taken to travel by car only and would have arrived at his destination 1 hour 30 minutes early. Find the distance he covered while travelling by car.
Barry is driving back home to Sue after a weekend away. If he travels at an average speed of 60kmph, the journey will take 40min longer then if he traveled at an average speed of 15kmph faster.
How far apart have Barry and Sue been this weekend?
A car can travels 450 km in 4 hours. If the speed is decreased by 15 1/2 kmph, how much time does the car take to cover a distance of 873 km?
Ram travels a certain distance at 3km/hr and reached 15 min late. If he travels at 4 km/hr, he reached 15 min earlier. What is the distance he has to travel.
A man travels 370km partly by train and partly by bus. If he covers 250km by train and rest by bus it takes him 4 hours but if he travels 130km by train and rest by bus he takes 18 minutes longer find the speed of train and that of bus?
