Two boats have same speed of 10 km/hr in… | Answer

Subject

Quantitative Aptitude

Topic

Speed & Distance

Two boats have same speed of 10 km/hr in still water. First boat starts from a point P and goes upstream. At the same time, second boat starts from same point P and goes downstream. After 3 hours, the sum of distances covered by them is 60 km. What is the speed of the stream (in km/hr)?
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2.5

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ঙ)

Cannot be determined

Explanation

Let the speed of stream be V km/hr. ⇒ Upstream speed = (10 – V) km/hr ⇒ Downstream speed = (10 + V) km/hr We know, Distance = Speed × Time Distance travelled by first boat in 3 hours upstream = 3 × (10 – V) km Distance travelled by second boat in 3 hours downstream = 3 × (10 + V) km ⇒ Total distance travelled = 3 × (10 – V) km + 3 × (10 + V) km = 60 km ⇒ 30 – 3V + 30 + 3V = 60 ⇒ 60 = 60 We see it is an identity, and any value of V would satisfy it. ∴ Speed of stream cannot be determined uniquely.

A man takes twice as long to row a distance against the stream as to row the same distance in favour of the stream. The ratio of the speed of the boat (in still water) and the stream is:Speed of a boat in standing water is 9 kmph and the speed of the stream is 5 kmph. A man rows to a place at a distance of 105 km and comes back to the starting point. The total time taken by him is:two trains are moving in opposite directions at 60 km/hr and 90 km/hr. Their lengths are 1/10 km and 9 km respectively. The time taken by slower train to cross the faster train in seconds is -A man can row three-quarters of a kilometre against the stream in 11×(1/4) minutes and down the stream in 7×(1/2) minutes. The speed (in km/hr) of the man in still water is:In a 300 m race A beats B by 5 metre or 6 seconds. B's time over the course is -A boatman goes 2 km against the current of the stream in 1 hour and goes 1 km along the current in 10 minutes. How long will it take to go 5 km in stationary water?A boat covers a certain distance downstream in 1 hour, while it comes back in 1x(1/2) hours. If the speed of the stream be 3 kmph, what is the speed of the boat in still water?A man buys tk 20 shares paying 9% dividend. The man wants to have an interest of 12% on his money. The market value of each share is-

Two boats have same speed of 10 km/hr in still water. First boat starts from a point P and goes upstream. At the same time, second boat starts from same point P and goes downstream. After 3 hours, the sum of distances covered by them is 60 km. What is the speed of the stream (in km/hr)?Reading

Two boats have same speed of 10 km/hr in still water. First boat starts from a point P and goes upstream. At the same time, second boat starts from same point P and goes downstream. After 3 hours, the sum of distances covered by them is 60 km. What is the speed of the stream (in km/hr)?

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Two boats have same speed of 10 km/hr in still water. First boat starts from a point P and goes upstream. At the same time, second boat starts from same point P and goes downstream. After 3 hours, the sum of distances covered by them is 60 km. What is the speed of the stream (in km/hr)?
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