If the ratio of speed of boat in downstream and speed of stream is 9 : 1, speed of current is 3 km per hr, What would be the distance travelled in upstream by the boat in 5 hours?
90 km
97 km
115 km
105 km
Explanation:
Ratio of speed of boat in downstream and speed of stream is 9 : 1
Given Speed of current = 3 km/ h
Speed of boat in downstream = 9 × 3 = 27 km/h
Speed of boat in still water = Speed of boat in downstream – Speed of current
= 27 – 3 = 24 km/h
Speed of boat in upstream = 24 – 3 = 21 km/h
Distance travelled by boat in upstream in 5 hours = 21 × 5 = 105 km
Ratio of speed of boat in downstream and speed of stream is 9 : 1
Given Speed of current = 3 km/ h
Speed of boat in downstream = 9 × 3 = 27 km/h
Speed of boat in still water = Speed of boat in downstream – Speed of current
= 27 – 3 = 24 km/h
Speed of boat in upstream = 24 – 3 = 21 km/h
Distance travelled by boat in upstream in 5 hours = 21 × 5 = 105 km