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Q:

A train covers a distance in 50 minutes, if it runs at a speed of 48kmph on an average. Find the speed at which the train must run to reduce the time of journey to 40 minutes.

A) 50 km/hr B) 60 km/hr
C) 65 km/hr D) 70 km/hr
 
Answer & Explanation Answer: B) 60 km/hr

Explanation:

We are having time and speed given, so first we will calculate the distance. Then we can get new speed for given time and distance.
Lets solve it.

Time = 50/60 hr = 5/6 hr
Speed = 48 mph
Distance = S*T = 48 * 5/6 = 40 km

New time will be 40 minutes so,
Time = 40/60 hr = 2/3 hr
Now we know,
Speed = Distance/Time
New speed = 40*3/2 kmph = 60kmph

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Filed Under: Time and Distance
Exam Prep: GRE

Q:

In 100 m race, A covers the distance in 36 seconds and B in 45 seconds. In this race A beats B by:

A) 20m B) 25m
C) 22.5m D) 9m
 
Answer & Explanation Answer: A) 20m

Explanation:

Distance covered by B in 9 sec. = (100/45)*9m = 20m

 

 A beats B by 20 metres.

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Filed Under: Races and Games

Q:

In 100 m race, A covers the distance in 36 seconds and B in 45 seconds. In this race A beats B by

A) 20 m B) 25 m
C) 22.5 m D) 9 m
 
Answer & Explanation Answer: A) 20 m

Explanation:

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Filed Under: Races and Games

Q:

The inner most membrane that covers the brain is

A) Pleura B) Duramater
C) Pia - mater D) Arachnoid membrane
 
Answer & Explanation Answer: C) Pia - mater

Explanation:
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Filed Under: Biology

Q:

The outer membrane that covers the brain is

A) Myelin sheath B) Dura mater
C) Arachnoid membrane D) Pia mater
 
Answer & Explanation Answer: B) Dura mater

Explanation:
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Filed Under: Biology