Q91. A boat whose speed is same as speed of a car i.e. x km/hr can travel d km upstream and return to the initial point in 8 ⅓ hours. While, the time taken by car to cover total distance travelled by the boat is ⅓ hour less than that by boat. If the time taken by the boat to cover 18 km downstream is 30 minutes more than to cover 6 km upstream and speed of stream is y km/hr, then which of the option is equal to the time taken by the boat to cover (2d+90) km in still water. (i) d / (x-y) + 3y (ii) d / (x-y) - 3y (iii) (180 / (x+y)) + 4
- AOption (a)
Both (i) & (iii)
- BOption (b)
Both (ii) & (iii)
- COption (c)
Both (i) & (ii)
- DOption (d)
only (iii)
- EOption (e)
only (i)
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Correct answer
Both (i) & (iii)