## Bharat Gupta is teaching live on Unacademy Plus

TIME, SPEED AND DISTANCE Boat 3

A man rowing upstream in a river accidently dropped his hat into the river. After travelling a distance of 30 m, he noticed it and immediately turned back to search for it. He found his hat after it had covered a distance of 20 m. If the speed of stream was r percent of the speed at which he rows in still eater, find value of r: a.20 b, 30 c. 25 d' 12.5 lo lo 1.

- 12-y Qa

Rohit and Mohit start from two point A and B on a river and travel towards each other. Speed of Mohit is thrice speed of Rohit. If Mohit had been travelling along the stream and Rohit against it they would meet after 1 hour. What is the time in minutes they would take to meet if Mohit is travelling against the current and Rohit along the current? a. 60 min b. 20 min c. 50 min d. 25 min e. can't be determined

Rohit and Mohit start from two point A and B on a river and travel towards each other. Speed of Mohit is thrice speed of Rohit. If Mohit had been travelling along the stream and Rohit against it they would meet after 1 hour. What is the time in minutes they would take to meet if Mohit is travelling against the current and Rohit along the current? a. 60 min b. 20 min c. 50 min d. 25 min e. can't be determined rint Rok

Mohan can row upstream from P to Q in 10 hours. The amount of time they take to row in still water for the same distance is 90 mins more than the time they take to row downstream. What is the time taken by him to row from Q to P? . 6 hr b.2.5 hr . 5 hr d, 3 hre.Data insufficient

Mohan can row upstream from P to Q in 10 hours. The amount of time they take to row in still water for the same distance is 90 mins more than the time they take to row downstream. What is the time taken by him to row from Q to P? a. 6 hr b. 2.5 hr c. 5 hr d. 3 hr e. Data insufficient du 3 dL dl 60 2

Aman was rowing a boat upstream in a river. He spotted a cat drowning and flowing. To save the cat, he immediately turn back and started rowing with his full capacity i.e. 12 m/s in still water. As soon as he reached the cat, he stopped rowing. It took him 15 seconds to pull the cat into the boat, while both cat and boat flowing with water. As soon as he pulled the cat, he started rowing upstream and reached the point where he first spotted the cat in 45 seconds. What is the distance in metres between the cat and the boat when Aman first spotted cat. Give that speed of current is 3 m/s a. 860 m b. 1200 m c. 960 m d. 645 m

Aman was rowing a boat upstream in a river. He spotted a cat drowning and flowing. To save the cat, he immediately turn back and started rowing with his full capacity i.e. 12 m/s in still water. As soon as he reached the cat, he stopped rowing. It took him 15 seconds to pull the cat into the boat, while both cat and boat flowing with water. As soon as he pulled the cat, he started rowing upstream and reached the point where he first spotted the cat in 40 seconds. What is the distance in metres between the cat and the boat when Aman first spotted cat Give that speed of current is 3 m/s a. 860 m b. 1200 m c. 960 m d. 645 m 2 Do 2-IS 2 3