Rahul takes 133 ⅓% more time to cover a distance in upstream as compare to cover same distance in downstream. If his friend’s speed and his speed are in ratio 6 : 7, when they go in downstream, then find the ratio of speed of Rahul and his friend in still water. (Speed of stream is same in both cases)
(a) 4 : 5
(b) 5 : 4
(c) 7 : 6
(d) 3 : 5
Sol:
Let times by Rahul to cover a distance ‘D’ in downstream is → 3x
So, time taken to cover ‘D’ distance in upstream → 7x
⇒ Speed of Rahul in downstream and upstream be 7x and 3x respectively
