The speed of a boat going downstream is 22 km/h. The speed of the stream is 1 km/h. How much distance in total will the boat cover going 3 hours downstream and 2 hours upstream?
Answer & explanation
Correct answer: option 3
we know that,
upstream speed = a - b
downstream speed = a + b
Where a is speed of boat and b is speed of stream
Given that,
a + b = 22km/hr and speed of stream b = 1 km/hr
So, a = 22 - 1 = 21 km/hr
Distance = Speed × Time
Total distance = 3 (a + b) + 2 (a - b) = 5a + by
using the above value of a and b
Total distance = 5 × 21 + 1 = 106 km