GMAT-Quantitative Aptitude
GMAT-Quantitative Aptitude
171. A train travels at an average speed of 90 km/hr without any stoppages. However, its average speed decrease to 60km/hr on account of stoppages. On an average, how many minutes per hour does the train stop?
- 12 minutes
- 18 minutes
- 24 minutes
- 20 minutes
172. Two trains A and B start simultaneously from stations X and Y towards each other respectively. After meeting at a point between X and Y, train A reaches station Y in 9 hours and train B reaches station X in 4 hours from the time they have met each other. If the speed of train A is 36 km/hr, what is the speed of train B?
- 24 km/hr
- 54 km/hr
- 81 km/hr
- 16 km/hr
173. A man moves from A to B at the rate of 4 km/hr. Had he moved at the rate of 3.67 km/hr, he would have taken 3 hours more to reach the destination. What is the distance between A and B?
- 33 kms
- 132 kms
- 36 kms
- 144 kms
174. A ship develops a leak 12 km from the shore. Despite the leak, the ship is able to move towards the shore at a speed of 8 km/hr. However, the shipcan stay afloat only for 20 minutes. If a rescue vessel were to leave from the shore towards the ship, and it takes 4 minutes to evacuate the crew and passengers of the ship, what should be the minimum speed of the rescue vessel in order to be able to successfully rescue the people aboard the ship?
- 53 km/hr
- 37 km/hr
- 28 km/hr
- 44 km/hr
175. A man driving his bike at 24 kmph reaches his office 5 minutes late. Had he driven 25% faster on an average he would have reached 4 minutes earlier than the scheduled time. How far is his office?
- 24 km
- 72 km
- 18 km
- Data Insufficient
176. When an object is dropped, the number of feet N that it falls is given by the formula N = ½gt2 where t is the time in seconds from the time it was dropped and g is 32.2. If it takes 5 seconds for the object to reach the ground, how many feet does it fall during the last 2 seconds?
- 64.4
- 96.6
- 161.0
- 257.6
177. If the wheel of a bicycle makes 560 revolutions in travelling 1.1 km, what is its radius?
- 31.25 cm
- 37.75 cm
- 35.15 cm
- 11.25 cm
178. Two workers A and B manufactured a batch of identical parts. A worked for 2 hours and B worked for 5 hours and they did half the job. Then they worked together for another 3 hours and they had to do (1/20)th of the job. How much time does B take to complete the job, if he worked alone?
- 24 hours
- 12 hours
- 15 hours
- 30 hours
179. Pipe A can fill a tank in 'a' hours. On account of a leak at the bottom of the tank it takes thrice as long to fill the tank. How long will the leak at the bottom of the tank take to empty a full tank, when pipe A is kept closed?
- (3/2)a hours
- (2/3)a
- (4/3)a
- (3/4)a
180. A and B working together can finish a job in T days. If A works alone and completes the job, he will take T + 5 days. If B works alone and completesthe same job, he will take T + 45 days. What is T?
- 25
- 60
- 15
- None of these