9. A boat travels with a speed of 22 km/h in
still water if the speed of the stream is
8 km/h; find :
(i) time taken by it to go 135 km
downstream.
(ii) time taken by it to go 105 km
downstream and return back.
Answers
Step-by-step explanation:
Speed of a boat in still water =22km/hr
Speed of water stream =8km/hr
Speed of boat in downstream =(22+8)=30km/hr
(boat travels in the direction of water stream)
Speed of boat in return =22−8=14km/hr
(boat travels in opposite direction of water stream)
Time taken in traveling downstream 105km =30105hr
Time taken in traveling return 105 km =14105 hr
Total time =30105 +14105=11 hrs
Step-by-step explanation:
speed of boat in still water is equal to 22 kilometre per hour
speed of water stream is equal to 8 kilometre per hour
speed of boat in
downstream is equal to 22 + 8 is equal to 30 kilometre per hour
boat travel in the direction of water stream
speed of boat in written is equal to 22 - 8 is equal to 14 kilometre per hour
boats travel in opposite direction of water stream
time taken in travelling downstream 105 kilometre is equal to 30105
time taken in travelling
return 105 kilometre is equal to 14105 hour
total time is equal to 30 105 + 14105 is equal to 11 hours