Related Questions

Sound travels fastest in
A Vacuum
B Air
C Glass
D Water
A person travels a certain distance at 3 km/hr and reaches 15 mi late. If he travels at 4 km/hr reaches 15 min late. If he travels at 4 km/hr reaches 15 min earlier. The distance he has to travel is -
A 8.5 km
B 6 km
C 7.2 km
D 12 km
A motorist estimates that his annual expenditure distance traveled . The cost when he travels 400 km is $100 and when he travels 600 km is $ 125 . The cost when he travels 640 km is -
A $ 130
B $ 125
C $133
D $165
Sound travels with a different speed in media. In what order does the velocity of sound increase in these media?
A Water, iron and air
B Iron, air and water
C Air, water and iron
D Iron, water and air
The speed of light is maximum in which of the following mediums?
A air
B vacuum
C water
D Glasss
Train X leaves Dhaka at 10:00 AM and travels East at a constant speed of x miles per hour . If another Train Y leaves Dhaka at 11:30 AM and travels east along the same tracks at speed 4x/3 , then at what time will Train Y catch Train X ?
A 4 PM same day
B 2 PM same day
C 6 PM same day
D 1 PM same day
If two planes leave the same airport at 1:00 PM, how many miles apart will they be at 3:00 PM if one travels directly north at 150 mph and the other travels directly west at 200 mph?
A 50 miles
B 100 miles
C 500 miles
D 700 miles
If two planes leave the same airport at 1:00 p.m., how many miles apart will they be at 3:00 p.m. if one travels directly towards north at 150 miles per hour and the other travels directly towards west at 200 miles per hour?
A 50 miles
B 100 miles
C 400 miles
D 500 miles
A train travels at an average speed of 50 miles per hour for 2.5 hour, and then travels at an average speed of 70 miles per hour for 1.5 hours. How far did the train travel in the entire 4 hour?
A 200 miles
B 230 miles
C 150 miles
D 300 miles
A ferry, when empty , travels twice as fast as when it is full. It travels 20 miles south with a cargo, spends 30 minutes for unloading , and returns to its original port empty in a total of 8 hours , what is the speed of the ferry when it is empty?
A 8 mph
B 10 mph
C 12 mph
D 15 mph

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