# Tsd (Average Speed, Effective Speed)

10 Questions | Total Attempts: 45  Settings  .

• 1.
Jim travels the first 3 hours of his journey at 60 mph speed and the remaining 5 hours at 24 mph speed. What is the average speed of Jim's travel in mph? ​
• A.

42

• B.

36

• C.

37.5

• D.

42.5

• 2.
A man travels from home to office at 50 kph and returns at the speed of 30 kmph. Find his average speed in kmph.
• A.

37.5

• B.

35

• C.

40

• D.

47.5

• 3.
You start from point A, travel at 10 kmph and reach point B and return from point A at the speed of 'x' kmph. Find the value of x if the average speed of the journey is 16 kmph. Distance from A to B is 2550 km.
• A.

50 kmph

• B.

40 kmph

• C.

22 kmph

• D.

None of the above

• 4.
Josh travels for 30 minutes at 50kmph, for the other 20 minutes, he travels  at the speed of 30kmph, for the next 60 minutes at the speed of 60kmph. Find his average speed for this journey in kmph.
• A.

570

• B.

570/11

• C.

350

• D.

350/11

• 5.
There are 3 points A, B, C. You travel from A to B at speed 'S1' and B to C at speed 'S2' (Speeds are in kmph). Distance from A to B is 'D1' and B to C is 'D2'. Find the average speed from A to C if the time taken is 25.5 hours from A to B and 25.5 hours from B to C.
• A.

2*S1*S2 / (S1 + S2)

• B.

(S1 + S2) / 2

• C.

S1 * S2 / (S1 + S2)

• D.

None of the above

• 6.
A swimmer covers a distance of 28 Km against the current and 40 Km in the direction of the current. If in each case he takes 4 hours, then the speed of the current in kmph is:
• A.

1

• B.

1.5

• C.

2

• D.

3

• 7.
A boat travels 2 Km upstream in a stream flowing at 3 Km/h and, then returns downstream to the starting point in 30 minutes. The speed of the boat in still water in kmph is:
• A.

17

• B.

9

• C.

13

• D.

15

• 8.
A boat takes 9 hours to travel a distance upstream and takes 3 hours to travel the same distance downstream. If the speed of the boat in still water in 4 Km/h, then what is the velocity of the stream in km/h?
• A.

1

• B.

2

• C.

3

• D.

4

• 9.
If upstream speed and downstream speed are given as 10 and 30 kmph, then find the velocity of the stream in kmph
• A.

20

• B.

15

• C.

10

• D.

5

• 10.
The concept of effective speed can be applied to which of the following conditions?
• A.

Boats and Streams

• B.

Escalators

• C.

Two trains travelling in the opposite directions

• D.

Only a and b

• E.

A, b, c all the three. Back to top