3. Speed of boat in upstream is 21km/hr and the speed of the stream is 5 km/hr.
What is the time required to cover 52 km for the boat in still water?
Answers
Answered by
2
Answer:
Hope you liked it
Step-by-step explanation:
Let the total distance = 84 km (LCM of 21 and 28)
⇒ Then time taken to go upstream = 84/21 = 4 hr
⇒ Time take to go downstream = 84/28 = 3 hr
⇒ Total distance (upstream + downstream) = 2 × 84 = 168
⇒ Total time taken = 4 + 3 = 7 hr
∴ Average speed of the journey = 168/7 = 24 km/hr
Similar questions