Wipro Company Numerical Ability Time and Work

Jamie and Jane are painting houses. Jamie can paint a house in 3 days and Jane can paint a house in 4. How many days will it take them to paint 14 houses together?
a)7
b)13
c)14
d)19
e)24

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Wipro Other Question

A train leaves London at 5 AM, and a train leaves Paris an hour later. If the two trains pass each other right in the middle of the journey, and the distance between London and Paris is 400 km, and the speed of the London train is 60 km/h, find the speed of the Paris train.
a)45 km/hr
b)56 km/hr
c)75 km/hr
d)86 km/hr
e)90 km/hr The average weight of 5 melons is 40. If my melon weighs 34, by how much will the average weight of the melons change once I add my own melon?
a)Up by 2
b)Up by 1
c)Down by 1
d)Down by 2
e)Down by 1.4