Interpreting Graphs

What is the speed of van?

• 10m/s

• 15 m/s

• Can't say

• 20 m/s

Answer explanation

As at each second on x axis, speed on y axis is same that is 10 m/s.

How do you know from the graph that Jake is running faster than Razi?

• Gradient (Jaki) < Gradient (Razi)

• Gradient (Jaki)> Gradient (Razi)

• Intercept (Razi) > Intercept (Jale)

• Intercept (Razi) < Intercept (Jake)

Answer explanation

Because, gradient here is denoting papa per minute, i.e. speed of runners. Higher the gradient, higher the speed hence faster.

For how long had Razi been running before Jake started?

• 5 minutes

• 3 minutes

• 10 minutes

• 2 minutes

Where were the runners 9 minutes after Razi started running?

• 5 laps

• 4 laps

• 6 laps

• 8 laps

Answer explanation

Because, at 9 minutes, both runners completed 6 lapes together, which can be observed in graph easily.

Plumber B charges $250 for a job. Find the time for the job.

• 2 hours

• 3 hours

• 4 hours

• 5 hours

Answer explanation

Because, corresponding to $250 on time axis is 3 hours. Observe the graph to confirm.

Find the fixed charge for plumber A.

• ₹200

• $300

• $400

• $200

Answer explanation

Because y intercept for plumber A is $200. Units given is dollars and not rupees.

Find the charge per hour for plumber B.

• $100

• $50

• $200

• None of these.

Which tariff is cheaper for a 5-minute call?

• Tarrif A

• Tarrif B

What length of call costs the same on both tariffs?

• 2 minutes

• 3 minutes

• 4 minutes

• 5 minutes

What is the fixed charge for tarrif A?

• ₹50

• ₹150

• ₹200

• ₹100