Time and Distance

1.        A person crosses a 600 m long street in 5 minutes. What is his speed in km per hour?

A.     3.6    B.     7.2 C.     8.4    D.     10

Answer & Explanation

Answer: Option B  Explanation:  Speed =         600     m/sec. 5 x 60     = 2 m/sec.  Converting m/sec to km/hr (see important formulas section)     =         2 x     18         km/hr 5     = 7.2 km/hr.  View Answer Workspace Report Discuss in Forum

 

2.        An aeroplane covers a certain distance at a speed of 240 kmph in 5 hours. To cover the same distance in 1                       hours, it must travel at a speed of:

A.     300 kmph    B.     360 kmph C.     600 kmph    D.     720 kmph

Answer & Explanation

Answer: Option D  Explanation:  Distance = (240 x 5) = 1200 km.  Speed = Distance/Time  Speed = 1200/(5/3) km/hr.     [We can write 1 hours as 5/3 hours]  Required speed =         1200 x     3     km/hr     = 720 km/hr. 5  View Answer Workspace Report Discuss in Forum

3.        If a person walks at 14 km/hr instead of 10 km/hr, he would have walked 20 km more. The actual distance travelled by him is:

A.     50 km    B.     56 km C.     70 km    D.     80 km

Answer & Explanation

Answer: Option A  Explanation:  Let the actual distance travelled be x km.  Then,     x     =     x + 20 10     14  14x = 10x + 200  4x = 200  x = 50 km.  View Answer Workspace Report Discuss in Forum

4.        A train can travel 50% faster than a car. Both start from point A at the same time and reach point B 75 kms away from A at the same time. On the way, however, the train lost about 12.5 minutes while stopping at the stations. The speed of the car is:

A.     100 kmph    B.     110 kmph C.     120 kmph    D.     130 kmph

Answer & Explanation

Answer: Option C  Explanation:  Let speed of the car be x kmph.  Then, speed of the train =     150     x     =         3     x     kmph. 100     2      75     –     75     =     125 x     (3/2)x     10 x 60      75     –     50     =     5 x     x     24  x =         25 x24         = 120 kmph. 5  View Answer Workspace Report Discuss in Forum

5.        Excluding stoppages, the speed of a bus is 54 kmph and including stoppages, it is 45 kmph. For how many minutes does the bus stop per hour?

A.     9    B.     10 C.     12    D.     20

Answer & Explanation

Answer: Option B  Explanation:  Due to stoppages, it covers 9 km less.  Time taken to cover 9 km =         9     x 60     min     = 10 min. 54